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JComboBox in Java Swing

JComboBox is Drop down box with multiple values in Java Swing.

It is defined as javax.swing.JComboBox<E>.

Here E is type of element of JComboBox.

public class JComboBox
extends JComponent
implements ItemSelectable, ListDataListener, ActionListener, Accessible

public class JComboBox

extends JComponent

implements ItemSelectable, ListDataListener, ActionListener, Accessible

JComboBox Constructors

Sr No	Constructors and Description
1	JComboBox() Create a JComboBox with default default data model
2	JComboBox(ComboBoxModel aModel) Create a JComboBox with ComboBoxModel aModel
3	JComboBox(E[] items) Create a JComboBox with specified array
4	JComboBox(Vector items) Create a JComboBox with specified Vector

Methods of JComboBox

Sr No	Methods and Description
1	void addItem(E item) Add an Item to item list
2	Object getSelectedItem() Returns the selected Item
3	void removeItem(Object anObject) Remove an Item from Item list
4	void removeItem(Object anObject) Remove an Item from Item list
5	void addActionListener(ActionListener l) Add action listener
6	getItemAt(int index) Get Item at specified index

JComboBox add and show items

Create a frame with any size.
Create Reference for Container, JLables and JComboBox.
get content page and set its layout null.
Create JLabels and JComboBox objects.
Add elements to JComboBox using addItem() and by using String[]
Set bounds for JLables and JComboBox
Add all Components to container.

Examples of JComboBox

package swing;

import java.awt.Container;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class JComboBoxExample1 extends JFrame {

    Container container;
    JLabel label1, label2;
    JComboBox<String> jComboBox1, jComboBox2;

    public JComboBoxExample1() {
        container = this.getContentPane();
        container.setLayout(null);

        /*First label and combobox*/
        label1 = new JLabel("Select Language");
        label1.setBounds(50, 50, 100, 30);
        jComboBox1 = new JComboBox<>();
        jComboBox1.addItem("C/ C++");
        jComboBox1.addItem("Java");
        jComboBox1.addItem("PHP");
        jComboBox1.addItem("Python");
        jComboBox1.addItem("ASP.Net");
        jComboBox1.setBounds(200, 50, 150, 30);

        /*Second label and combobox*/
        label2 = new JLabel("Expertise Level");
        label2.setBounds(50, 120, 100, 30);
        String[] experties = {"Beginner", "Intermediate", "Advanced", "Expert"};
        jComboBox2 = new JComboBox<String>(experties);
        jComboBox2.setBounds(200, 120, 150, 30);
        //adding components
        container.add(label1);
        container.add(jComboBox1);
        container.add(label2);
        container.add(jComboBox2);
    }

    public static void main(String[] args) {
        JComboBoxExample1 frame = new JComboBoxExample1();
        frame.setTitle("JComboBox Example");
        frame.setVisible(true);
        frame.setSize(400, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

package swing;

import java.awt.Container;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

public class JComboBoxExample1 extends JFrame {

Container container;

JLabel label1, label2;

JComboBox<String> jComboBox1, jComboBox2;

public JComboBoxExample1() {

container = this.getContentPane();

container.setLayout(null);

/*First label and combobox*/

label1 = new JLabel("Select Language");

label1.setBounds(50, 50, 100, 30);

jComboBox1 = new JComboBox<>();

jComboBox1.addItem("C/ C++");

jComboBox1.addItem("Java");

jComboBox1.addItem("PHP");

jComboBox1.addItem("Python");

jComboBox1.addItem("ASP.Net");

jComboBox1.setBounds(200, 50, 150, 30);

/*Second label and combobox*/

label2 = new JLabel("Expertise Level");

label2.setBounds(50, 120, 100, 30);

String[] experties = {"Beginner", "Intermediate", "Advanced", "Expert"};

jComboBox2 = new JComboBox<String>(experties);

jComboBox2.setBounds(200, 120, 150, 30);

//adding components

container.add(label1);

container.add(jComboBox1);

container.add(label2);

container.add(jComboBox2);

}

public static void main(String[] args) {

JComboBoxExample1 frame = new JComboBoxExample1();

frame.setTitle("JComboBox Example");

frame.setVisible(true);

frame.setSize(400, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

JComboBox actionlistener get selected item and get selected index

jComboBox1.addActionListener(this); is used to add action listener to jComboBox1.

You have to override actionPerformed(ActionEvent e) to handle combo box event.

combo.getSelectedItem() displays the selected item

combo.getSelectedIndex() is used to display selected item index.

JComboBox indexing starts from 0.

jcombobox get selected item example

import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class JComboBoxExample2 extends JFrame implements ActionListener {

    Container container;
    JLabel label1, label2, label3;
    JComboBox<String> jComboBox1;

    public JComboBoxExample2() {
        container = this.getContentPane();
        container.setLayout(null);

        label1 = new JLabel("Your Favourite car ");
        label1.setBounds(10, 50, 150, 30);
        String[] cars = {"BMW", "Honda City", "Ford Aspire", "Land Rover", "Mercedes Benz"};
        jComboBox1 = new JComboBox<>(cars);

        jComboBox1.setBounds(200, 50, 150, 30);
        Font f = new Font("Verdana", Font.BOLD, 20);
        label2 = new JLabel();
        label2.setFont(f);
        label2.setForeground(Color.RED);
        label2.setBounds(10, 150, 500, 50);

        label3 = new JLabel();
        label3.setFont(f);
        label3.setForeground(Color.RED);
        label3.setBounds(10, 200, 500, 50);

        //adding components
        container.add(label1);
        container.add(jComboBox1);
        container.add(label2);
        container.add(label3);
        //add actionlistement to combobox
        jComboBox1.addActionListener(this);

    }

    public void actionPerformed(ActionEvent e) {
        JComboBox combo = (JComboBox) e.getSource();

        label2.setText("Your Favourite Car is " + combo.getSelectedItem());
        label3.setText("Its Position is " + combo.getSelectedIndex());
    }

    public static void main(String[] args) {
        JComboBoxExample2 frame = new JComboBoxExample2();
        frame.setTitle("JComboBox Example");
        frame.setVisible(true);
        frame.setSize(500, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

import java.awt.Color;

import java.awt.Container;

import java.awt.Font;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

public class JComboBoxExample2 extends JFrame implements ActionListener {

Container container;

JLabel label1, label2, label3;

JComboBox<String> jComboBox1;

public JComboBoxExample2() {

container = this.getContentPane();

container.setLayout(null);

label1 = new JLabel("Your Favourite car ");

label1.setBounds(10, 50, 150, 30);

String[] cars = {"BMW", "Honda City", "Ford Aspire", "Land Rover", "Mercedes Benz"};

jComboBox1 = new JComboBox<>(cars);

jComboBox1.setBounds(200, 50, 150, 30);

Font f = new Font("Verdana", Font.BOLD, 20);

label2 = new JLabel();

label2.setFont(f);

label2.setForeground(Color.RED);

label2.setBounds(10, 150, 500, 50);

label3 = new JLabel();

label3.setFont(f);

label3.setForeground(Color.RED);

label3.setBounds(10, 200, 500, 50);

//adding components

container.add(label1);

container.add(jComboBox1);

container.add(label2);

container.add(label3);

//add actionlistement to combobox

jComboBox1.addActionListener(this);

}

public void actionPerformed(ActionEvent e) {

JComboBox combo = (JComboBox) e.getSource();

label2.setText("Your Favourite Car is " + combo.getSelectedItem());

label3.setText("Its Position is " + combo.getSelectedIndex());

}

public static void main(String[] args) {

JComboBoxExample2 frame = new JComboBoxExample2();

frame.setTitle("JComboBox Example");

frame.setVisible(true);

frame.setSize(500, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

Fig: **JComboBox actionlistener get selected item and get selected index**

JComboBox set selected item and set selected index

create JComboBox
To select specific item based on name use comboBoxRef.setSelectedItem("Item Name");
To select specific item based on index use comboBoxRef.setSelectedIndex(3);
Index number must be between 0 to itemSize-1

import java.awt.Container;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class JComboBoxExample3 extends JFrame {

    Container container;
    JLabel label1, label2;
    JComboBox<String> jComboBox1, jComboBox2;

    public JComboBoxExample3() {
        container = this.getContentPane();
        container.setLayout(null);

        label1 = new JLabel("Payment Mode ");
        label1.setBounds(10, 50, 150, 30);
        String[] paymentModes = {"Cash", "DD", "BANK TRANSFER", "UPI", "OTHER"};
        jComboBox1 = new JComboBox<>(paymentModes);
        jComboBox1.setSelectedItem("BANK TRANSFER");
        jComboBox1.setBounds(200, 50, 150, 30);

        label2 = new JLabel("Payment Term ");
        label2.setBounds(10, 100, 150, 30);
        String[] paymentTerm = {"Monthly", "Quarterly", "Half Year", "Year"};
        jComboBox2 = new JComboBox<>(paymentTerm);
        jComboBox2.setSelectedIndex(3);
        jComboBox2.setBounds(200, 100, 150, 30);

        //adding components
        container.add(label1);
        container.add(jComboBox1);
         container.add(label2);
        container.add(jComboBox2);

    }

    public static void main(String[] args) {
        JComboBoxExample3 frame = new JComboBoxExample3();
        frame.setTitle("JComboBox Example");
        frame.setVisible(true);
        frame.setSize(500, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

import java.awt.Container;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

public class JComboBoxExample3 extends JFrame {

Container container;

JLabel label1, label2;

JComboBox<String> jComboBox1, jComboBox2;

public JComboBoxExample3() {

container = this.getContentPane();

container.setLayout(null);

label1 = new JLabel("Payment Mode ");

label1.setBounds(10, 50, 150, 30);

String[] paymentModes = {"Cash", "DD", "BANK TRANSFER", "UPI", "OTHER"};

jComboBox1 = new JComboBox<>(paymentModes);

jComboBox1.setSelectedItem("BANK TRANSFER");

jComboBox1.setBounds(200, 50, 150, 30);

label2 = new JLabel("Payment Term ");

label2.setBounds(10, 100, 150, 30);

String[] paymentTerm = {"Monthly", "Quarterly", "Half Year", "Year"};

jComboBox2 = new JComboBox<>(paymentTerm);

jComboBox2.setSelectedIndex(3);

jComboBox2.setBounds(200, 100, 150, 30);

//adding components

container.add(label1);

container.add(jComboBox1);

container.add(label2);

container.add(jComboBox2);

}

public static void main(String[] args) {

JComboBoxExample3 frame = new JComboBoxExample3();

frame.setTitle("JComboBox Example");

frame.setVisible(true);

frame.setSize(500, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

**Fig JComboBox set selected item and set selected index**

jcombobox get selected item using ItemListener

JComboBox Example ItemListener

Create JComboBox
Add ItemListner to this
override itemStateChanged(ItemEvent e) method
get Item Event Source from combobox
select item and index by using getSelectedItem() and getSelectedIndex()

import java.awt.Color;
import java.awt.Container;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class JComboBoxExample4 extends JFrame implements ItemListener {

    Container container;
    JLabel label1, label2, label3;
    JComboBox<String> jComboBox1;

    public JComboBoxExample4() {
        container = this.getContentPane();
        container.setLayout(null);

        label1 = new JLabel("Your Feedback ");
        label1.setBounds(10, 50, 150, 30);
        String[] paymentModes = {"Poor", "Average", "Good", "Excellent"};
        jComboBox1 = new JComboBox<>(paymentModes);
        jComboBox1.setSelectedItem("Good");
        jComboBox1.setBounds(200, 50, 150, 30);
        label2 = new JLabel();
        label2.setBounds(10, 100, 500, 30);
        label2.setForeground(Color.RED);

        label3 = new JLabel();
        label3.setBounds(10, 130, 500, 30);
        label3.setForeground(Color.RED);

        jComboBox1.addItemListener(this);
        //adding components
        container.add(label1);
        container.add(jComboBox1);
        container.add(label2);
        container.add(label3);

    }

    @Override
    public void itemStateChanged(ItemEvent e) {
        if (e.getSource() == jComboBox1) {
            label2.setText("You Selected " + jComboBox1.getSelectedItem());
            label3.setText("Index value is " + jComboBox1.getSelectedIndex());
        }
    }

    public static void main(String[] args) {
        JComboBoxExample4 frame = new JComboBoxExample4();
        frame.setTitle("JComboBox Example");
        frame.setVisible(true);
        frame.setSize(500, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

import java.awt.Color;

import java.awt.Container;

import java.awt.event.ItemEvent;

import java.awt.event.ItemListener;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

public class JComboBoxExample4 extends JFrame implements ItemListener {

Container container;

JLabel label1, label2, label3;

JComboBox<String> jComboBox1;

public JComboBoxExample4() {

container = this.getContentPane();

container.setLayout(null);

label1 = new JLabel("Your Feedback ");

label1.setBounds(10, 50, 150, 30);

String[] paymentModes = {"Poor", "Average", "Good", "Excellent"};

jComboBox1 = new JComboBox<>(paymentModes);

jComboBox1.setSelectedItem("Good");

jComboBox1.setBounds(200, 50, 150, 30);

label2 = new JLabel();

label2.setBounds(10, 100, 500, 30);

label2.setForeground(Color.RED);

label3 = new JLabel();

label3.setBounds(10, 130, 500, 30);

label3.setForeground(Color.RED);

jComboBox1.addItemListener(this);

//adding components

container.add(label1);

container.add(jComboBox1);

container.add(label2);

container.add(label3);

}

@Override

public void itemStateChanged(ItemEvent e) {

if (e.getSource() == jComboBox1) {

label2.setText("You Selected " + jComboBox1.getSelectedItem());

label3.setText("Index value is " + jComboBox1.getSelectedIndex());

}

public static void main(String[] args) {

JComboBoxExample4 frame = new JComboBoxExample4();

frame.setTitle("JComboBox Example");

frame.setVisible(true);

frame.setSize(500, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

JComboBox Show Image in combo box using ListCellRenderer and ItemListner

import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.util.Vector;
import javax.swing.ImageIcon;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.ListCellRenderer;
import static javax.swing.SwingConstants.CENTER;

public class JComboBoxExample6 extends JFrame implements ItemListener {

    Container container;
    JLabel label1, label2, label3;
    JComboBox<City> jComboBox1;
    JPanel mainPanel, comboPanel, infoPanel;
    ImageIcon imageIcon;
    Vector<City> cityList = new Vector<City>();

    public JComboBoxExample6() {
        container = this.getContentPane();
        mainPanel = new JPanel(new GridLayout(2, 0, 20, 20));
        comboPanel = new JPanel();
        ComboListInitializer();
        jComboBox1 = new JComboBox<City>(cityList);

        ComboBoxRenderer renderer = new ComboBoxRenderer();
        renderer.setPreferredSize(new Dimension(200, 50));
        jComboBox1.setRenderer(renderer);
        jComboBox1.setMaximumRowCount(4);
        jComboBox1.addItemListener(this);

        comboPanel.add(jComboBox1);
        infoPanel = new JPanel();
        label2 = new JLabel();
        infoPanel.add(label2);
        label3 = new JLabel();
        infoPanel.add(label3);
        mainPanel.add(comboPanel);
        mainPanel.add(infoPanel);
        container.add(mainPanel);
    }

    @Override
    public void itemStateChanged(ItemEvent e) {
        if (e.getSource() == jComboBox1) {
            City c = (City) jComboBox1.getSelectedItem();
            label2.setText("You Selected " + c.getName());
            label3.setIcon(c.getImage());
        }
    }

    public void ComboListInitializer() {
        cityList.add(new City(1, "Delhi", new ImageIcon("D://icons/india-gate.png")));
        cityList.add(new City(2, "Agra", new ImageIcon("D://icons/taj-mahal.png")));
        cityList.add(new City(3, "Kolkata", new ImageIcon("D://icons/victoria-memorial.png")));
        cityList.add(new City(4, "Channai", new ImageIcon("D://icons/beach.png")));
        cityList.add(new City(5, "Bengaluru", new ImageIcon("D://icons/buildings.png")));
    }

    public static void main(String[] args) {
        JComboBoxExample6 frame = new JComboBoxExample6();
        frame.setTitle("JComboBox Example");
        frame.setVisible(true);
        frame.setSize(500, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

    class ComboBoxRenderer extends JLabel
            implements ListCellRenderer<Object> {

        public ComboBoxRenderer() {
            setOpaque(true);
            setHorizontalAlignment(LEFT);
            setVerticalAlignment(CENTER);
        }

        @Override
        public Component getListCellRendererComponent(
                JList list,
                Object value,
                int index,
                boolean isSelected,
                boolean cellHasFocus) {
            if (value instanceof City) {
                City city = (City) value;
                setText(city.getName());
                setIcon(city.getImage());
            }
            if (isSelected) {
                setBackground(Color.BLUE);
                setForeground(Color.WHITE);
                setFont(new Font("Verdana", Font.BOLD, 22));
            } else {
                setBackground(list.getBackground());
                setForeground(list.getForeground());
                setFont(list.getFont());
            }

            return this;
        }

    }
}

class City {

    int id;
    String name;
    ImageIcon image;

    public City() {
    }

    public City(int id, String name, ImageIcon image) {
        this.id = id;
        this.name = name;
        this.image = image;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public ImageIcon getImage() {
        return image;
    }

    public void setImage(ImageIcon image) {
        this.image = image;
    }

}

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import java.awt.Color;

import java.awt.Component;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ItemEvent;

import java.awt.event.ItemListener;

import java.util.Vector;

import javax.swing.ImageIcon;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JList;

import javax.swing.JPanel;

import javax.swing.ListCellRenderer;

import static javax.swing.SwingConstants.CENTER;

public class JComboBoxExample6 extends JFrame implements ItemListener {

Container container;

JLabel label1, label2, label3;

JComboBox<City> jComboBox1;

JPanel mainPanel, comboPanel, infoPanel;

ImageIcon imageIcon;

Vector<City> cityList = new Vector<City>();

public JComboBoxExample6() {

container = this.getContentPane();

mainPanel = new JPanel(new GridLayout(2, 0, 20, 20));

comboPanel = new JPanel();

ComboListInitializer();

jComboBox1 = new JComboBox<City>(cityList);

ComboBoxRenderer renderer = new ComboBoxRenderer();

renderer.setPreferredSize(new Dimension(200, 50));

jComboBox1.setRenderer(renderer);

jComboBox1.setMaximumRowCount(4);

jComboBox1.addItemListener(this);

comboPanel.add(jComboBox1);

infoPanel = new JPanel();

label2 = new JLabel();

infoPanel.add(label2);

label3 = new JLabel();

infoPanel.add(label3);

mainPanel.add(comboPanel);

mainPanel.add(infoPanel);

container.add(mainPanel);

}

@Override

public void itemStateChanged(ItemEvent e) {

if (e.getSource() == jComboBox1) {

City c = (City) jComboBox1.getSelectedItem();

label2.setText("You Selected " + c.getName());

label3.setIcon(c.getImage());

}

public void ComboListInitializer() {

cityList.add(new City(1, "Delhi", new ImageIcon("D://icons/india-gate.png")));

cityList.add(new City(2, "Agra", new ImageIcon("D://icons/taj-mahal.png")));

cityList.add(new City(3, "Kolkata", new ImageIcon("D://icons/victoria-memorial.png")));

cityList.add(new City(4, "Channai", new ImageIcon("D://icons/beach.png")));

cityList.add(new City(5, "Bengaluru", new ImageIcon("D://icons/buildings.png")));

}

public static void main(String[] args) {

JComboBoxExample6 frame = new JComboBoxExample6();

frame.setTitle("JComboBox Example");

frame.setVisible(true);

frame.setSize(500, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

class ComboBoxRenderer extends JLabel

implements ListCellRenderer<Object> {

public ComboBoxRenderer() {

setOpaque(true);

setHorizontalAlignment(LEFT);

setVerticalAlignment(CENTER);

}

@Override

public Component getListCellRendererComponent(

JList list,

Object value,

int index,

boolean isSelected,

boolean cellHasFocus) {

if (value instanceof City) {

City city = (City) value;

setText(city.getName());

setIcon(city.getImage());

}

if (isSelected) {

setBackground(Color.BLUE);

setForeground(Color.WHITE);

setFont(new Font("Verdana", Font.BOLD, 22));

} else {

setBackground(list.getBackground());

setForeground(list.getForeground());

setFont(list.getFont());

}

return this;

}

class City {

int id;

String name;

ImageIcon image;

public City() {

}

public City(int id, String name, ImageIcon image) {

this.id = id;

this.name = name;

this.image = image;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public ImageIcon getImage() {

return image;

}

public void setImage(ImageIcon image) {

this.image = image;

}

JComboBox Show Image in combo box using ListCellRenderer and ItemListner — Fig: Show image in JComboBox

How to use combobox in java netbeans

We have developed many examples in netbeans.

It is a very simple copy and above example and paste in netbeans/ eclipse then run.

Run a swing program is same as simple java program

Fig: How to use combobox in java netbeans

Image Reference

https://freeicons.io/indian-republic-day-icons/india-gate-indian%20republic%20day-icon-7661#

Taj Mahal icon icon by Icons8

https://thenounproject.com/term/victoria-memorial/2165511/

Registration Form in Java Swing with MySql Database

Registration Form in Java Swing is covered in this Post.

To develop this project we used NetBeans IDE.

Steps to develop Registration Form in Java Swing is as below

Create User Interface (UI) Using JFrame
Collect all data in Model sent from UI
Validate and Process Received data
Saving data to MySql Database

Here we have added three external Jar files

mysql-connector-jar-5.1.14-bin.jar – To connect Java program with MySql Database
jBCrypt-0.4.jar – To encrypt password
jdatepicker-1.3.4.jar– To include date picker in JFrame

To Develop Registration form we are considering example of Student.

We will create basic interface to collect student data in JFrame.

Our Final UI JFrame will as below

1 Create User Interface using JFrame

A. Create a basic structure for frame

In main method we created RegisterFrame class object.

set title, visibility, specified frame coordinated and height and width with bounds and other properties.

Created constructor RegisterFrame() to create and initialize frame components (JLable, JTextBox, JButton, …) .

Method setBounds() is used to set location, width and height of components.

addComponents() is used to add components to Container.

package ebhor.frame;

import javax.swing.JFrame;

public class RegisterFrame extends JFrame {

    public RegisterFrame() {

    }

    public void setBounds() {

    }

    public void addComponents() {

    }

    public static void main(String[] args) {
        RegisterFrame frame = new RegisterFrame();
        frame.setTitle("Student Register Form");
        frame.setVisible(true);
        frame.setBounds(500, 100, 500, 700);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setResizable(true);

    }

}

package ebhor.frame;

import javax.swing.JFrame;

public class RegisterFrame extends JFrame {

public RegisterFrame() {

}

public void setBounds() {

}

public void addComponents() {

}

public static void main(String[] args) {

RegisterFrame frame = new RegisterFrame();

frame.setTitle("Student Register Form");

frame.setVisible(true);

frame.setBounds(500, 100, 500, 700);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setResizable(true);

}

Output of above code is as below

JFrame Basic Size — Fig: JFrame height and width

This is basic layout for our Registration form.

B. Adding Components to JFrame

Components JLabel, JTextField, JRadioButton, JPasswordField, JCombobox, JButton etc are used here.

To select Date from Date Picker additional Jar jdatepicker-1.3.4.jar is added to project.

B Add the basic component in JFrame

Components are Declare as Instance variable
Objects of components are created inside Default Constructor
setBounds() is used to set position ,width and height of components.
addComponents() is used to add components in Container.
addActionListener() is used to add action listener on registerButton.
actionPerformed() is over ridden to handle event

Last two steps are handled later on.

package ebhor.frame;

import java.awt.Container;
import java.awt.Font;
import javax.swing.*;

public class RegisterFrame extends JFrame {

    JLabel message;
    JLabel nameLabel, dobLabel, genderLabel, dobFormat;
    JTextField nameField;
    JRadioButton genderMale, genderFemale;
    ButtonGroup genderGroup;

    JLabel mailIdLabel, mobileNoLabel;
    JTextField mailIdField, mobileNoField;

    JLabel passwordLabel, rePasswordLabel;
    JPasswordField passwordField, rePasswordField;

    JLabel programLabel;
    JComboBox<String> programList;

    JLabel branchLabel, semesterLabel;
    JComboBox<String> branchList;
    JComboBox<Integer> semesterList;

    JButton registerButton;
    Container container;

    public RegisterFrame() {
        message = new JLabel("Register a new Student");
        message.setFont(new Font("Courier", Font.BOLD, 20));
        nameLabel = new JLabel("Name");
        nameField = new JTextField();

        dobLabel = new JLabel("DOB");

        genderLabel = new JLabel("Gender");
        genderMale = new JRadioButton("Male", true);
        genderFemale = new JRadioButton("Female");
        genderGroup = new ButtonGroup();
        genderGroup.add(genderMale);
        genderGroup.add(genderFemale);

        mailIdLabel = new JLabel("Mail Id");
        mailIdField = new JTextField();

        mobileNoLabel = new JLabel("Mobile No");
        mobileNoField = new JTextField();

        passwordLabel = new JLabel("Password");
        passwordField = new JPasswordField();

        rePasswordLabel = new JLabel("Re Password");
        rePasswordField = new JPasswordField();

        programLabel = new JLabel("Courses");
        programList = new JComboBox<String>();

        programList.addItem("ME/M Tect");
        programList.addItem("BE/B Tect");
        programList.addItem("Diploma");

        branchLabel = new JLabel("Branch");
        branchList = new JComboBox<String>();

        branchList.addItem("Computer Science and Engineering");
        branchList.addItem("Electronics and Telecommunications");
        branchList.addItem("Information Technology");
        branchList.addItem("Electrical Engineering");
        branchList.addItem("Electrical and Electronics Engineering");
        branchList.addItem("Civil Engineering");

        semesterLabel = new JLabel("Semester");
        semesterList = new JComboBox<>();
        semesterList.addItem(1);
        semesterList.addItem(2);
        semesterList.addItem(3);
        semesterList.addItem(4);
        semesterList.addItem(5);
        semesterList.addItem(6);
        semesterList.addItem(7);
        semesterList.addItem(8);

        registerButton = new JButton("Register");
        container = getContentPane();
        container.setLayout(null);
        setBounds();
        addComponents();

    }

    public void setBounds() {
        message.setBounds(50, 10, 600, 30);
        nameLabel.setBounds(50, 60, 100, 30);
        nameField.setBounds(130, 60, 200, 30);

        dobLabel.setBounds(50, 110, 100, 30);

        genderLabel.setBounds(50, 160, 100, 30);
        genderMale.setBounds(130, 160, 100, 30);
        genderFemale.setBounds(240, 160, 100, 30);

        mailIdLabel.setBounds(50, 210, 100, 30);
        mailIdField.setBounds(130, 210, 200, 30);

        mobileNoLabel.setBounds(50, 260, 100, 30);
        mobileNoField.setBounds(130, 260, 200, 30);

        passwordLabel.setBounds(50, 310, 100, 30);
        passwordField.setBounds(130, 310, 200, 30);

        rePasswordLabel.setBounds(50, 360, 100, 30);
        rePasswordField.setBounds(130, 360, 200, 30);

        programLabel.setBounds(50, 410, 100, 30);
        programList.setBounds(130, 410, 200, 30);

        branchLabel.setBounds(50, 460, 100, 30);
        branchList.setBounds(130, 460, 200, 30);

        semesterLabel.setBounds(50, 510, 100, 30);
        semesterList.setBounds(130, 510, 200, 30);

        registerButton.setBounds(130, 550, 200, 30);
    }

    public void addComponents() {
        container.add(message);
        container.add(nameLabel);
        container.add(nameField);
        container.add(dobLabel);
        container.add(genderLabel);
        container.add(genderMale);
        container.add(genderFemale);
        container.add(mailIdLabel);
        container.add(mailIdField);
        container.add(mobileNoLabel);
        container.add(mobileNoField);
        container.add(passwordLabel);
        container.add(passwordField);
        container.add(rePasswordLabel);
        container.add(rePasswordField);
        container.add(programLabel);
        container.add(programList);
        container.add(branchLabel);
        container.add(branchList);
        container.add(semesterLabel);
        container.add(semesterList);
        container.add(registerButton);
    }

    public static void main(String[] args) {
        RegisterFrame frame = new RegisterFrame();
        frame.setTitle("Student Register Form");
        frame.setVisible(true);
        frame.setBounds(500, 100, 500, 700);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setResizable(true);

    }

}

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package ebhor.frame;

import java.awt.Container;

import java.awt.Font;

import javax.swing.*;

public class RegisterFrame extends JFrame {

JLabel message;

JLabel nameLabel, dobLabel, genderLabel, dobFormat;

JTextField nameField;

JRadioButton genderMale, genderFemale;

ButtonGroup genderGroup;

JLabel mailIdLabel, mobileNoLabel;

JTextField mailIdField, mobileNoField;

JLabel passwordLabel, rePasswordLabel;

JPasswordField passwordField, rePasswordField;

JLabel programLabel;

JComboBox<String> programList;

JLabel branchLabel, semesterLabel;

JComboBox<String> branchList;

JComboBox<Integer> semesterList;

JButton registerButton;

Container container;

public RegisterFrame() {

message = new JLabel("Register a new Student");

message.setFont(new Font("Courier", Font.BOLD, 20));

nameLabel = new JLabel("Name");

nameField = new JTextField();

dobLabel = new JLabel("DOB");

genderLabel = new JLabel("Gender");

genderMale = new JRadioButton("Male", true);

genderFemale = new JRadioButton("Female");

genderGroup = new ButtonGroup();

genderGroup.add(genderMale);

genderGroup.add(genderFemale);

mailIdLabel = new JLabel("Mail Id");

mailIdField = new JTextField();

mobileNoLabel = new JLabel("Mobile No");

mobileNoField = new JTextField();

passwordLabel = new JLabel("Password");

passwordField = new JPasswordField();

rePasswordLabel = new JLabel("Re Password");

rePasswordField = new JPasswordField();

programLabel = new JLabel("Courses");

programList = new JComboBox<String>();

programList.addItem("ME/M Tect");

programList.addItem("BE/B Tect");

programList.addItem("Diploma");

branchLabel = new JLabel("Branch");

branchList = new JComboBox<String>();

branchList.addItem("Computer Science and Engineering");

branchList.addItem("Electronics and Telecommunications");

branchList.addItem("Information Technology");

branchList.addItem("Electrical Engineering");

branchList.addItem("Electrical and Electronics Engineering");

branchList.addItem("Civil Engineering");

semesterLabel = new JLabel("Semester");

semesterList = new JComboBox<>();

semesterList.addItem(1);

semesterList.addItem(2);

semesterList.addItem(3);

semesterList.addItem(4);

semesterList.addItem(5);

semesterList.addItem(6);

semesterList.addItem(7);

semesterList.addItem(8);

registerButton = new JButton("Register");

container = getContentPane();

container.setLayout(null);

setBounds();

addComponents();

}

public void setBounds() {

message.setBounds(50, 10, 600, 30);

nameLabel.setBounds(50, 60, 100, 30);

nameField.setBounds(130, 60, 200, 30);

dobLabel.setBounds(50, 110, 100, 30);

genderLabel.setBounds(50, 160, 100, 30);

genderMale.setBounds(130, 160, 100, 30);

genderFemale.setBounds(240, 160, 100, 30);

mailIdLabel.setBounds(50, 210, 100, 30);

mailIdField.setBounds(130, 210, 200, 30);

mobileNoLabel.setBounds(50, 260, 100, 30);

mobileNoField.setBounds(130, 260, 200, 30);

passwordLabel.setBounds(50, 310, 100, 30);

passwordField.setBounds(130, 310, 200, 30);

rePasswordLabel.setBounds(50, 360, 100, 30);

rePasswordField.setBounds(130, 360, 200, 30);

programLabel.setBounds(50, 410, 100, 30);

programList.setBounds(130, 410, 200, 30);

branchLabel.setBounds(50, 460, 100, 30);

branchList.setBounds(130, 460, 200, 30);

semesterLabel.setBounds(50, 510, 100, 30);

semesterList.setBounds(130, 510, 200, 30);

registerButton.setBounds(130, 550, 200, 30);

}

public void addComponents() {

container.add(message);

container.add(nameLabel);

container.add(nameField);

container.add(dobLabel);

container.add(genderLabel);

container.add(genderMale);

container.add(genderFemale);

container.add(mailIdLabel);

container.add(mailIdField);

container.add(mobileNoLabel);

container.add(mobileNoField);

container.add(passwordLabel);

container.add(passwordField);

container.add(rePasswordLabel);

container.add(rePasswordField);

container.add(programLabel);

container.add(programList);

container.add(branchLabel);

container.add(branchList);

container.add(semesterLabel);

container.add(semesterList);

container.add(registerButton);

}

public static void main(String[] args) {

RegisterFrame frame = new RegisterFrame();

frame.setTitle("Student Register Form");

frame.setVisible(true);

frame.setBounds(500, 100, 500, 700);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setResizable(true);

}

After adding basic components it will create Frame as below

Adding Components in JFrame — Fig: Adding Basic Components in JFrame

C Add JDatePicker in JFrame

First check jdatepicker-1.3.4.jar is added in project

Imports for JDatePicker

import javax.swing.JFormattedTextField.AbstractFormatter;
import org.jdatepicker.impl.JDatePanelImpl;
import org.jdatepicker.impl.JDatePickerImpl;
import org.jdatepicker.impl.UtilDateModel;

import javax.swing.JFormattedTextField.AbstractFormatter;

import org.jdatepicker.impl.JDatePanelImpl;

import org.jdatepicker.impl.JDatePickerImpl;

import org.jdatepicker.impl.UtilDateModel;

Adding JDatePicker in constructor

 /*Adding JDatePicker date picker*/
        UtilDateModel model = new UtilDateModel();
        model.setDate(1999, 01, 02);
        model.setSelected(true);
        Properties p = new Properties();
        p.put("text.today", "Today");
        p.put("text.month", "Month");
        p.put("text.year", "Year");
        datePanel = new JDatePanelImpl(model, p);
        datePicker = new JDatePickerImpl(datePanel, new DateLabelFormatter());
        dobFormat = new JLabel("(yyyy-mm-dd)");
        /*End Date picker*/

/*Adding JDatePicker date picker*/

UtilDateModel model = new UtilDateModel();

model.setDate(1999, 01, 02);

model.setSelected(true);

Properties p = new Properties();

p.put("text.today", "Today");

p.put("text.month", "Month");

p.put("text.year", "Year");

datePanel = new JDatePanelImpl(model, p);

datePicker = new JDatePickerImpl(datePanel, new DateLabelFormatter());

dobFormat = new JLabel("(yyyy-mm-dd)");

/*End Date picker*/

complete code after adding JDatePicker

package ebhor.frame;

import java.awt.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Properties;
import javax.swing.*;
/*imports for JDatePicker*/
import javax.swing.JFormattedTextField.AbstractFormatter;
import org.jdatepicker.impl.JDatePanelImpl;
import org.jdatepicker.impl.JDatePickerImpl;
import org.jdatepicker.impl.UtilDateModel;

public class RegisterFrame extends JFrame {

    JLabel message;
    JLabel nameLabel, dobLabel, genderLabel, dobFormat;
    JTextField nameField;
    JRadioButton genderMale, genderFemale;
    ButtonGroup genderGroup;

    JLabel mailIdLabel, mobileNoLabel;
    JTextField mailIdField, mobileNoField;

    JLabel passwordLabel, rePasswordLabel;
    JPasswordField passwordField, rePasswordField;

    JLabel programLabel;
    JComboBox<String> programList;

    JLabel branchLabel, semesterLabel;
    JComboBox<String> branchList;
    JComboBox<Integer> semesterList;

    JButton registerButton;
    Container container;

    /*JDatePicker*/
    JDatePanelImpl datePanel;
    JDatePickerImpl datePicker;

    public RegisterFrame() {
        message = new JLabel("Register a new Student");
        message.setFont(new Font("Courier", Font.BOLD, 20));
        nameLabel = new JLabel("Name");
        nameField = new JTextField();

        dobLabel = new JLabel("DOB");
        //dobField = new JTextField();

        /*Adding JDatePicker date picker*/
        UtilDateModel model = new UtilDateModel();
        model.setDate(1999, 01, 02);
        model.setSelected(true);
        Properties p = new Properties();
        p.put("text.today", "Today");
        p.put("text.month", "Month");
        p.put("text.year", "Year");
        datePanel = new JDatePanelImpl(model, p);
        datePicker = new JDatePickerImpl(datePanel, new DateLabelFormatter());
        dobFormat = new JLabel("(yyyy-mm-dd)");
        /*End Date picker*/

        genderLabel = new JLabel("Gender");
        genderMale = new JRadioButton("Male", true);
        genderFemale = new JRadioButton("Female");
        genderGroup = new ButtonGroup();
        genderGroup.add(genderMale);
        genderGroup.add(genderFemale);

        mailIdLabel = new JLabel("Mail Id");
        mailIdField = new JTextField();

        mobileNoLabel = new JLabel("Mobile No");
        mobileNoField = new JTextField();

        passwordLabel = new JLabel("Password");
        passwordField = new JPasswordField();

        rePasswordLabel = new JLabel("Re Password");
        rePasswordField = new JPasswordField();

        programLabel = new JLabel("Courses");
        programList = new JComboBox<String>();

        programList.addItem("ME/M Tect");
        programList.addItem("BE/B Tect");
        programList.addItem("Diploma");

        branchLabel = new JLabel("Branch");
        branchList = new JComboBox<String>();

        branchList.addItem("Computer Science and Engineering");
        branchList.addItem("Electronics and Telecommunications");
        branchList.addItem("Information Technology");
        branchList.addItem("Electrical Engineering");
        branchList.addItem("Electrical and Electronics Engineering");
        branchList.addItem("Civil Engineering");

        semesterLabel = new JLabel("Semester");
        semesterList = new JComboBox<>();
        semesterList.addItem(1);
        semesterList.addItem(2);
        semesterList.addItem(3);
        semesterList.addItem(4);
        semesterList.addItem(5);
        semesterList.addItem(6);
        semesterList.addItem(7);
        semesterList.addItem(8);

        registerButton = new JButton("Register");
        container = getContentPane();
        container.setLayout(null);
        setBounds();
        addComponents();

    }

    public void setBounds() {
        message.setBounds(50, 10, 600, 30);
        nameLabel.setBounds(50, 60, 100, 30);
        nameField.setBounds(130, 60, 200, 30);

        dobLabel.setBounds(50, 110, 100, 30);
        /*JDatePicker*/
        datePicker.setBounds(130, 110, 200, 30);
        dobFormat.setBounds(350, 110, 200, 30);

        genderLabel.setBounds(50, 160, 100, 30);
        genderMale.setBounds(130, 160, 100, 30);
        genderFemale.setBounds(240, 160, 100, 30);

        mailIdLabel.setBounds(50, 210, 100, 30);
        mailIdField.setBounds(130, 210, 200, 30);

        mobileNoLabel.setBounds(50, 260, 100, 30);
        mobileNoField.setBounds(130, 260, 200, 30);

        passwordLabel.setBounds(50, 310, 100, 30);
        passwordField.setBounds(130, 310, 200, 30);

        rePasswordLabel.setBounds(50, 360, 100, 30);
        rePasswordField.setBounds(130, 360, 200, 30);

        programLabel.setBounds(50, 410, 100, 30);
        programList.setBounds(130, 410, 200, 30);

        branchLabel.setBounds(50, 460, 100, 30);
        branchList.setBounds(130, 460, 200, 30);

        semesterLabel.setBounds(50, 510, 100, 30);
        semesterList.setBounds(130, 510, 200, 30);

        registerButton.setBounds(130, 550, 200, 30);
    }

    public void addComponents() {
        container.add(message);
        container.add(nameLabel);
        container.add(nameField);
        container.add(dobLabel);
        /*JDatePicker*/
        container.add(datePicker);
        container.add(dobFormat);
        container.add(genderLabel);
        container.add(genderMale);
        container.add(genderFemale);
        container.add(mailIdLabel);
        container.add(mailIdField);
        container.add(mobileNoLabel);
        container.add(mobileNoField);
        container.add(passwordLabel);
        container.add(passwordField);
        container.add(rePasswordLabel);
        container.add(rePasswordField);
        container.add(programLabel);
        container.add(programList);
        container.add(branchLabel);
        container.add(branchList);
        container.add(semesterLabel);
        container.add(semesterList);
        container.add(registerButton);
    }

    public static void main(String[] args) {
        RegisterFrame frame = new RegisterFrame();
        frame.setTitle("Student Register Form");
        frame.setVisible(true);
        frame.setBounds(500, 100, 500, 700);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setResizable(true);

    }

    /*JDate Picker drop down*/
    public class DateLabelFormatter extends AbstractFormatter {

        private String datePattern = "yyyy-MM-dd";
        private SimpleDateFormat dateFormatter = new SimpleDateFormat(datePattern);

        @Override
        public Object stringToValue(String text) throws ParseException {
            return dateFormatter.parseObject(text);
        }

        @Override
        public String valueToString(Object value) throws ParseException {
            if (value != null) {
                Calendar cal = (Calendar) value;
                return dateFormatter.format(cal.getTime());
            }

            return "";
        }

    }
}

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package ebhor.frame;

import java.awt.*;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Properties;

import javax.swing.*;

/*imports for JDatePicker*/

import javax.swing.JFormattedTextField.AbstractFormatter;

import org.jdatepicker.impl.JDatePanelImpl;

import org.jdatepicker.impl.JDatePickerImpl;

import org.jdatepicker.impl.UtilDateModel;

public class RegisterFrame extends JFrame {

JLabel message;

JLabel nameLabel, dobLabel, genderLabel, dobFormat;

JTextField nameField;

JRadioButton genderMale, genderFemale;

ButtonGroup genderGroup;

JLabel mailIdLabel, mobileNoLabel;

JTextField mailIdField, mobileNoField;

JLabel passwordLabel, rePasswordLabel;

JPasswordField passwordField, rePasswordField;

JLabel programLabel;

JComboBox<String> programList;

JLabel branchLabel, semesterLabel;

JComboBox<String> branchList;

JComboBox<Integer> semesterList;

JButton registerButton;

Container container;

/*JDatePicker*/

JDatePanelImpl datePanel;

JDatePickerImpl datePicker;

public RegisterFrame() {

message = new JLabel("Register a new Student");

message.setFont(new Font("Courier", Font.BOLD, 20));

nameLabel = new JLabel("Name");

nameField = new JTextField();

dobLabel = new JLabel("DOB");

//dobField = new JTextField();

/*Adding JDatePicker date picker*/

UtilDateModel model = new UtilDateModel();

model.setDate(1999, 01, 02);

model.setSelected(true);

Properties p = new Properties();

p.put("text.today", "Today");

p.put("text.month", "Month");

p.put("text.year", "Year");

datePanel = new JDatePanelImpl(model, p);

datePicker = new JDatePickerImpl(datePanel, new DateLabelFormatter());

dobFormat = new JLabel("(yyyy-mm-dd)");

/*End Date picker*/

genderLabel = new JLabel("Gender");

genderMale = new JRadioButton("Male", true);

genderFemale = new JRadioButton("Female");

genderGroup = new ButtonGroup();

genderGroup.add(genderMale);

genderGroup.add(genderFemale);

mailIdLabel = new JLabel("Mail Id");

mailIdField = new JTextField();

mobileNoLabel = new JLabel("Mobile No");

mobileNoField = new JTextField();

passwordLabel = new JLabel("Password");

passwordField = new JPasswordField();

rePasswordLabel = new JLabel("Re Password");

rePasswordField = new JPasswordField();

programLabel = new JLabel("Courses");

programList = new JComboBox<String>();

programList.addItem("ME/M Tect");

programList.addItem("BE/B Tect");

programList.addItem("Diploma");

branchLabel = new JLabel("Branch");

branchList = new JComboBox<String>();

branchList.addItem("Computer Science and Engineering");

branchList.addItem("Electronics and Telecommunications");

branchList.addItem("Information Technology");

branchList.addItem("Electrical Engineering");

branchList.addItem("Electrical and Electronics Engineering");

branchList.addItem("Civil Engineering");

semesterLabel = new JLabel("Semester");

semesterList = new JComboBox<>();

semesterList.addItem(1);

semesterList.addItem(2);

semesterList.addItem(3);

semesterList.addItem(4);

semesterList.addItem(5);

semesterList.addItem(6);

semesterList.addItem(7);

semesterList.addItem(8);

registerButton = new JButton("Register");

container = getContentPane();

container.setLayout(null);

setBounds();

addComponents();

}

public void setBounds() {

message.setBounds(50, 10, 600, 30);

nameLabel.setBounds(50, 60, 100, 30);

nameField.setBounds(130, 60, 200, 30);

dobLabel.setBounds(50, 110, 100, 30);

/*JDatePicker*/

datePicker.setBounds(130, 110, 200, 30);

dobFormat.setBounds(350, 110, 200, 30);

genderLabel.setBounds(50, 160, 100, 30);

genderMale.setBounds(130, 160, 100, 30);

genderFemale.setBounds(240, 160, 100, 30);

mailIdLabel.setBounds(50, 210, 100, 30);

mailIdField.setBounds(130, 210, 200, 30);

mobileNoLabel.setBounds(50, 260, 100, 30);

mobileNoField.setBounds(130, 260, 200, 30);

passwordLabel.setBounds(50, 310, 100, 30);

passwordField.setBounds(130, 310, 200, 30);

rePasswordLabel.setBounds(50, 360, 100, 30);

rePasswordField.setBounds(130, 360, 200, 30);

programLabel.setBounds(50, 410, 100, 30);

programList.setBounds(130, 410, 200, 30);

branchLabel.setBounds(50, 460, 100, 30);

branchList.setBounds(130, 460, 200, 30);

semesterLabel.setBounds(50, 510, 100, 30);

semesterList.setBounds(130, 510, 200, 30);

registerButton.setBounds(130, 550, 200, 30);

}

public void addComponents() {

container.add(message);

container.add(nameLabel);

container.add(nameField);

container.add(dobLabel);

/*JDatePicker*/

container.add(datePicker);

container.add(dobFormat);

container.add(genderLabel);

container.add(genderMale);

container.add(genderFemale);

container.add(mailIdLabel);

container.add(mailIdField);

container.add(mobileNoLabel);

container.add(mobileNoField);

container.add(passwordLabel);

container.add(passwordField);

container.add(rePasswordLabel);

container.add(rePasswordField);

container.add(programLabel);

container.add(programList);

container.add(branchLabel);

container.add(branchList);

container.add(semesterLabel);

container.add(semesterList);

container.add(registerButton);

}

public static void main(String[] args) {

RegisterFrame frame = new RegisterFrame();

frame.setTitle("Student Register Form");

frame.setVisible(true);

frame.setBounds(500, 100, 500, 700);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setResizable(true);

}

/*JDate Picker drop down*/

public class DateLabelFormatter extends AbstractFormatter {

private String datePattern = "yyyy-MM-dd";

private SimpleDateFormat dateFormatter = new SimpleDateFormat(datePattern);

@Override

public Object stringToValue(String text) throws ParseException {

return dateFormatter.parseObject(text);

}

@Override

public String valueToString(Object value) throws ParseException {

if (value != null) {

Calendar cal = (Calendar) value;

return dateFormatter.format(cal.getTime());

}

return "";

}

DateLabelFormatter class is used to show date selector.

JDatePicker Example — Fig: JDatePicker Addition in JFrame

It will complete our UI

2 Collect all data in Model sent from UI

To collect data Register button is clicked and all data from text box and other input fields are collected and set to student Model.

Lets First See student model Students.java

This class contains basic fields of student, constructors, getter and setter methods and to string method.

package ebhor.model;

import java.io.Serializable;
import java.sql.Date;
import java.sql.Timestamp;

public class Student implements  Serializable{

    private long id;
    private String name;
    private Date dob;
    private String gender;
    private String mailId;
    private String mobileNo;
    private String password;
    private String rePassword;
    private String encPassword;//Encrypted password
    private String program;
    private String branch;
    private int semester;
    private Timestamp addDate;

    public Student() {
    }

    public Student(String name, Date dob, String gender, String mailId, String mobileNo, String password, String rePassword, String program, String branch, int semester) {
        this.name = name;
        this.dob = dob;
        this.gender = gender;
        this.mailId = mailId;
        this.mobileNo = mobileNo;
        this.password = password;
        this.rePassword = rePassword;
        this.program = program;
        this.branch = branch;
        this.semester = semester;
    }

    public Student(long id, String name, Date dob, String gender, String mailId, String mobileNo, String password, String rePassword, String program, String branch, int semester, Timestamp addDate) {
        this.id = id;
        this.name = name;
        this.dob = dob;
        this.gender = gender;
        this.mailId = mailId;
        this.mobileNo = mobileNo;
        this.password = password;
        this.rePassword = rePassword;
        this.program = program;
        this.branch = branch;
        this.semester = semester;
        this.addDate = addDate;
    }

    @Override
    public String toString() {
        return "Student{" + "id=" + id + ", name=" + name + ", dob=" + dob + ", gender=" + gender + ", mailId=" + mailId + ", mobileNo=" + mobileNo + ", password=" + password + ", rePassword=" + rePassword + ", program=" + program + ", branch=" + branch + ", semester=" + semester + ", addDate=" + addDate + '}';
    }

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Date getDob() {
        return dob;
    }

    public void setDob(Date dob) {
        this.dob = dob;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getMailId() {
        return mailId;
    }

    public void setMailId(String mailId) {
        this.mailId = mailId;
    }

    public String getMobileNo() {
        return mobileNo;
    }

    public void setMobileNo(String mobileNo) {
        this.mobileNo = mobileNo;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getRePassword() {
        return rePassword;
    }

    public void setRePassword(String rePassword) {
        this.rePassword = rePassword;
    }

    public String getProgram() {
        return program;
    }

    public void setProgram(String program) {
        this.program = program;
    }

    public String getBranch() {
        return branch;
    }

    public void setBranch(String branch) {
        this.branch = branch;
    }

    public int getSemester() {
        return semester;
    }

    public void setSemester(int semester) {
        this.semester = semester;
    }

    public Timestamp getAddDate() {
        return addDate;
    }

    public void setAddDate(Timestamp addDate) {
        this.addDate = addDate;
    }

    public String getEncPassword() {
        return encPassword;
    }

    public void setEncPassword(String encPassword) {
        this.encPassword = encPassword;
    }

}

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package ebhor.model;

import java.io.Serializable;

import java.sql.Date;

import java.sql.Timestamp;

public class Student implements Serializable{

private long id;

private String name;

private Date dob;

private String gender;

private String mailId;

private String mobileNo;

private String password;

private String rePassword;

private String encPassword;//Encrypted password

private String program;

private String branch;

private int semester;

private Timestamp addDate;

public Student() {

}

public Student(String name, Date dob, String gender, String mailId, String mobileNo, String password, String rePassword, String program, String branch, int semester) {

this.name = name;

this.dob = dob;

this.gender = gender;

this.mailId = mailId;

this.mobileNo = mobileNo;

this.password = password;

this.rePassword = rePassword;

this.program = program;

this.branch = branch;

this.semester = semester;

}

public Student(long id, String name, Date dob, String gender, String mailId, String mobileNo, String password, String rePassword, String program, String branch, int semester, Timestamp addDate) {

this.id = id;

this.name = name;

this.dob = dob;

this.gender = gender;

this.mailId = mailId;

this.mobileNo = mobileNo;

this.password = password;

this.rePassword = rePassword;

this.program = program;

this.branch = branch;

this.semester = semester;

this.addDate = addDate;

}

@Override

public String toString() {

return "Student{" + "id=" + id + ", name=" + name + ", dob=" + dob + ", gender=" + gender + ", mailId=" + mailId + ", mobileNo=" + mobileNo + ", password=" + password + ", rePassword=" + rePassword + ", program=" + program + ", branch=" + branch + ", semester=" + semester + ", addDate=" + addDate + '}';

}

public long getId() {

return id;

}

public void setId(long id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Date getDob() {

return dob;

}

public void setDob(Date dob) {

this.dob = dob;

}

public String getGender() {

return gender;

}

public void setGender(String gender) {

this.gender = gender;

}

public String getMailId() {

return mailId;

}

public void setMailId(String mailId) {

this.mailId = mailId;

}

public String getMobileNo() {

return mobileNo;

}

public void setMobileNo(String mobileNo) {

this.mobileNo = mobileNo;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getRePassword() {

return rePassword;

}

public void setRePassword(String rePassword) {

this.rePassword = rePassword;

}

public String getProgram() {

return program;

}

public void setProgram(String program) {

this.program = program;

}

public String getBranch() {

return branch;

}

public void setBranch(String branch) {

this.branch = branch;

}

public int getSemester() {

return semester;

}

public void setSemester(int semester) {

this.semester = semester;

}

public Timestamp getAddDate() {

return addDate;

}

public void setAddDate(Timestamp addDate) {

this.addDate = addDate;

}

public String getEncPassword() {

return encPassword;

}

public void setEncPassword(String encPassword) {

this.encPassword = encPassword;

}

Adding following code to RegisterFrame.java

ActionLister is added for registerButton
actionPerformed() is overridden to handle click event on register button

Based on genderFemale and genderMale is selected gender variable.is set based on that.

Similar way storing programName, branchName and semesterName from respective dropdown list.

To get value from JDatePicker datePicker.getJFormattedTextField().getText() is used.

It returns value in string to convert string date to java.sql.date Date.valueOf(dobString) is used.

public void addActionListener() {
        registerButton.addActionListener(this);
    }

    @Override
    public void actionPerformed(ActionEvent e) {

        if (e.getSource() == registerButton) { 
            System.out.println("Register Button Clicked");
            String gender = null;
            if (genderFemale.isSelected()) {
                gender = "Female";
            }
            if (genderMale.isSelected()) {
                gender = "Male";
            }
            String programName = programList.getSelectedItem().toString();
            String branchName = branchList.getSelectedItem().toString();
            int semesterNo = Integer.parseInt(semesterList.getSelectedItem().toString());
            String dobString = datePicker.getJFormattedTextField().getText();
            if (dobString.isEmpty()) {
                JOptionPane.showMessageDialog(null, "Date of Birth is Empty");
                return;
            }
            Date dob = null;
            try {
                dob = Date.valueOf(dobString);
            } catch (IllegalArgumentException ex) {
                System.out.println("Exception " + ex);
                JOptionPane.showMessageDialog(null, "Date of birth format is in correct");
                return;
            }
            System.out.println("name " + nameField.getText() + " dob " + dobString
                    + " gender " + gender + " mailid " + mailIdField.getText()
                    + " mobileNo " + mobileNoField.getText() + " password " + passwordField.getText()
                    + " rePassword " + rePasswordField.getText() + " branch " + branchName
                    + " semester " + semesterNo);

            Student student = new Student(nameField.getText(), dob, gender, mailIdField.getText(), mobileNoField.getText(), passwordField.getText(), rePasswordField.getText(), programName, branchName, semesterNo);
        }
    }

public void addActionListener() {

registerButton.addActionListener(this);

}

@Override

public void actionPerformed(ActionEvent e) {

if (e.getSource() == registerButton) {

System.out.println("Register Button Clicked");

String gender = null;

if (genderFemale.isSelected()) {

gender = "Female";

}

if (genderMale.isSelected()) {

gender = "Male";

}

String programName = programList.getSelectedItem().toString();

String branchName = branchList.getSelectedItem().toString();

int semesterNo = Integer.parseInt(semesterList.getSelectedItem().toString());

String dobString = datePicker.getJFormattedTextField().getText();

if (dobString.isEmpty()) {

JOptionPane.showMessageDialog(null, "Date of Birth is Empty");

return;

}

Date dob = null;

try {

dob = Date.valueOf(dobString);

} catch (IllegalArgumentException ex) {

System.out.println("Exception " + ex);

JOptionPane.showMessageDialog(null, "Date of birth format is in correct");

return;

}

System.out.println("name " + nameField.getText() + " dob " + dobString

+ " gender " + gender + " mailid " + mailIdField.getText()

+ " mobileNo " + mobileNoField.getText() + " password " + passwordField.getText()

+ " rePassword " + rePasswordField.getText() + " branch " + branchName

+ " semester " + semesterNo);

Student student = new Student(nameField.getText(), dob, gender, mailIdField.getText(), mobileNoField.getText(), passwordField.getText(), rePasswordField.getText(), programName, branchName, semesterNo);

}

3 Validate and Process Received data

Received data is stored in Student object.

We have already validated dob field.

Other fields are validated in Validation.java

All fields are checked for Empty.
Name length must be more than 4 and less than 20
Validation for Mail id
Mobile Number must be 10 digits long
Password must be between 8 to 20 characters
Password must contain One digit one upper case letter and special symbol
RePassword and password must match

package ebhor.frame;

import ebhor.model.Student;
import java.util.ArrayList;
import java.util.List;


public class Validation {

    public List<String> validateRegistration(Student student) {
        ArrayList<String> err = new ArrayList<String>();
        if (student.getName().isEmpty()) {
            err.add("Name can not be empty");
        } else if (student.getName().length() < 4) {
            err.add("Name is too short");
        } else if (student.getName().length() > 50) {
            err.add("Name is too long");
        } else if (!isString(student.getName())) {
            err.add("Only characters allowed in name");
        }
        if (student.getMailId().isEmpty()) {
            err.add("MailId can not be empty");
        } else if (!isValidEmailAddress(student.getMailId())) {
            err.add("MailId is not valid");
        }
        if (student.getMobileNo().isEmpty()) {
            err.add("Mobile Number can not be empty");
        } else if (student.getMobileNo().length() != 10) {
            err.add("Mobile Number must be 10 digit long");
        } else if (!isDigit(student.getMobileNo())) {
            err.add("Mobile Numbers must have only digits");
        }
        if (student.getPassword().isEmpty()) {
            err.add("Password not be empty");
        } else if (student.getPassword().length() < 8) {
            err.add("Password is too short");
        } else if (student.getPassword().length() > 20) {
            err.add("Password is too long");
        } else if (!isStrongPassword(student.getPassword())) {
            err.add("Enter Strong Password");
        }
        if (student.getRePassword().isEmpty()) {
            err.add("Re Password can not be empty");
        } else if (student.getRePassword().length() < 8) {
            err.add("Re Password is too short");
        } else if (student.getRePassword().length() > 20) {
            err.add("Re Password is too long");
        }
        if (!student.getPassword().equals(student.getRePassword())) {
            err.add("Both passwords are not matching");
        }
        return err;
    }


    public boolean isValidEmailAddress(String email) {
        String ePattern = "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\])|(([a-zA-Z\\-0-9]+\\.)+[a-zA-Z]{2,}))$";
        java.util.regex.Pattern p = java.util.regex.Pattern.compile(ePattern);
        java.util.regex.Matcher m = p.matcher(email);
        return m.matches();
    }

    //https://stackoverflow.com/a/15806080/876739
    public boolean isString(String name) {
        String ePattern = "^[\\p{L} '-]+$";
        java.util.regex.Pattern p = java.util.regex.Pattern.compile(ePattern);
        java.util.regex.Matcher m = p.matcher(name);
        return m.matches();
    }

//https://stackoverflow.com/a/3802238/876739
    public boolean isStrongPassword(String text) {
        String ePattern = "^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])(?=\\S+$).{8,}$";
        java.util.regex.Pattern p = java.util.regex.Pattern.compile(ePattern);
        java.util.regex.Matcher m = p.matcher(text);
        return m.matches();
    }
//https://stackoverflow.com/a/34253764/876739

    public boolean isDigit(String mobileNo) {
        boolean digits = mobileNo.chars().allMatch(Character::isDigit);
        return digits;
    }
}

package ebhor.frame;

import ebhor.model.Student;

import java.util.ArrayList;

import java.util.List;

public class Validation {

public List<String> validateRegistration(Student student) {

ArrayList<String> err = new ArrayList<String>();

if (student.getName().isEmpty()) {

err.add("Name can not be empty");

} else if (student.getName().length() < 4) {

err.add("Name is too short");

} else if (student.getName().length() > 50) {

err.add("Name is too long");

} else if (!isString(student.getName())) {

err.add("Only characters allowed in name");

}

if (student.getMailId().isEmpty()) {

err.add("MailId can not be empty");

} else if (!isValidEmailAddress(student.getMailId())) {

err.add("MailId is not valid");

}

if (student.getMobileNo().isEmpty()) {

err.add("Mobile Number can not be empty");

} else if (student.getMobileNo().length() != 10) {

err.add("Mobile Number must be 10 digit long");

} else if (!isDigit(student.getMobileNo())) {

err.add("Mobile Numbers must have only digits");

}

if (student.getPassword().isEmpty()) {

err.add("Password not be empty");

} else if (student.getPassword().length() < 8) {

err.add("Password is too short");

} else if (student.getPassword().length() > 20) {

err.add("Password is too long");

} else if (!isStrongPassword(student.getPassword())) {

err.add("Enter Strong Password");

}

if (student.getRePassword().isEmpty()) {

err.add("Re Password can not be empty");

} else if (student.getRePassword().length() < 8) {

err.add("Re Password is too short");

} else if (student.getRePassword().length() > 20) {

err.add("Re Password is too long");

}

if (!student.getPassword().equals(student.getRePassword())) {

err.add("Both passwords are not matching");

}

return err;

}

public boolean isValidEmailAddress(String email) {

String ePattern = "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-][email protected]((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\])|(([a-zA-Z\\-0-9]+\\.)+[a-zA-Z]{2,}))$";

java.util.regex.Pattern p = java.util.regex.Pattern.compile(ePattern);

java.util.regex.Matcher m = p.matcher(email);

return m.matches();

}

//https://stackoverflow.com/a/15806080/876739

public boolean isString(String name) {

String ePattern = "^[\\p{L} '-]+$";

java.util.regex.Pattern p = java.util.regex.Pattern.compile(ePattern);

java.util.regex.Matcher m = p.matcher(name);

return m.matches();

}

//https://stackoverflow.com/a/3802238/876739

public boolean isStrongPassword(String text) {

String ePattern = "^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])(?=\\S+$).{8,}$";

java.util.regex.Pattern p = java.util.regex.Pattern.compile(ePattern);

java.util.regex.Matcher m = p.matcher(text);

return m.matches();

}

//https://stackoverflow.com/a/34253764/876739

public boolean isDigit(String mobileNo) {

boolean digits = mobileNo.chars().allMatch(Character::isDigit);

return digits;

}

Creating object of validation and and checking for errors if error occurs then it is shown using showMessageDialog().

Student student = new Student(nameField.getText(), dob, gender, mailIdField.getText(), mobileNoField.getText(), passwordField.getText(), rePasswordField.getText(), programName, branchName, semesterNo);
            student.setEncPassword(BCrypt.hashpw(student.getPassword(), BCrypt.gensalt()));
            Validation v = new Validation();
            java.util.List<String> errors = v.validateRegistration(student);
            if (errors.size() > 0) {
                JOptionPane.showMessageDialog(null, errors.toArray());
                return;
            }

student.setEncPassword(BCrypt.hashpw(student.getPassword(), BCrypt.gensalt()));

Validation v = new Validation();

java.util.List<String> errors = v.validateRegistration(student);

if (errors.size() > 0) {

JOptionPane.showMessageDialog(null, errors.toArray());

return;

}

Processing Data

Processing data is done before and after validation

Based on male and female JRadioButton we assigned male or female to gender variable.
Get Dob from JDatePicker as string and then converted again to java.sql.Date.
BCrypt is used to encrypt password and set to encPassword().

4 Saving data to MySql Database

Validated and processed data and stored in Student object.

To save data of student object first create student table as given below.

CREATE TABLE student
  (
     id        BIGINT(20) UNSIGNED NOT NULL auto_increment,
     name      VARCHAR(200),
     dob       DATE,
     gender    VARCHAR(10),
     mailid    VARCHAR(100),
     mobile_no VARCHAR(12),
     password  VARCHAR(200),
     program    VARCHAR(100),
     branch    VARCHAR(100),
     semester  INT(2),
     add_date   TIMESTAMP DEFAULT CURRENT_TIMESTAMP(),
     PRIMARY KEY (id),
     UNIQUE KEY (mailid),
     UNIQUE KEY (mobile_no)
  )
engine=innodb
DEFAULT charset=utf8;

CREATE TABLE student

(

id BIGINT(20) UNSIGNED NOT NULL auto_increment,

name VARCHAR(200),

dob DATE,

gender VARCHAR(10),

mailid VARCHAR(100),

mobile_no VARCHAR(12),

password VARCHAR(200),

program VARCHAR(100),

branch VARCHAR(100),

semester INT(2),

add_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP(),

PRIMARY KEY (id),

UNIQUE KEY (mailid),

UNIQUE KEY (mobile_no)

)

engine=innodb

DEFAULT charset=utf8;

ConnectionFactory.java

This file is used to connect java with database and returns the connection object.

Database name :ebhor
Username: ebhor_user
Password: 21V6

package ebhor.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class ConnectionFactory {

    public static Connection getConnection() {
        Connection c = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            c = DriverManager.getConnection("jdbc:mysql://localhost:3306/ebhor?useUnicode=true&characterEncoding=UTF-8", "ebhor_user", "21V6");
        } catch (ClassNotFoundException e) {
            System.out.println("ClassNotFoundException " + e);
        } catch (SQLException e) {
            System.out.println("SQLException " + e);
        }
        return c;
    }
}

package ebhor.dao;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

public class ConnectionFactory {

public static Connection getConnection() {

Connection c = null;

try {

Class.forName("com.mysql.jdbc.Driver");

c = DriverManager.getConnection("jdbc:mysql://localhost:3306/ebhor?useUnicode=true&characterEncoding=UTF-8", "ebhor_user", "21V6");

} catch (ClassNotFoundException e) {

System.out.println("ClassNotFoundException " + e);

} catch (SQLException e) {

System.out.println("SQLException " + e);

}

return c;

}

RegisterDAO.java

registerStudent() takes a student object and save each field to database using java preparedStatement();

package ebhor.dao;

import com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException;
import ebhor.model.Student;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class RegisterDAO {

    Connection con = null;
    PreparedStatement ps = null;
    ResultSet rs = null;
    int st;//status

    public int registerStudent(Student student) {
        con = ConnectionFactory.getConnection();
        try {
            String query = "insert into "
                    + "student "
                    + "(name,dob,gender,mailid,mobile_no,password,program,branch,semester) "
                    + "values(?,?,?,?,?,?,?,?,?)";
            ps = con.prepareStatement(query);
            ps.setString(1, student.getName());
            ps.setDate(2, student.getDob());
            ps.setString(3, student.getGender());
            ps.setString(4, student.getMailId());
            ps.setString(5, student.getMobileNo());
            ps.setString(6, student.getEncPassword());
            ps.setString(7, student.getProgram());
            ps.setString(8, student.getBranch());
            ps.setInt(9, student.getSemester());
            st = ps.executeUpdate();
            System.out.println("Inserted  student " + st);
        } catch (MySQLIntegrityConstraintViolationException e) {
            /*This exception is throws when user is already 
            registed with same id, mobileno or mail id*/
            e.printStackTrace();
            st = -1;
        } catch (SQLException e) {
            /*Any SqlException occures then this will execute*/
            e.printStackTrace();
            st = -2;
        }
        return st;
    }
}

package ebhor.dao;

import com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException;

import ebhor.model.Student;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

public class RegisterDAO {

Connection con = null;

PreparedStatement ps = null;

ResultSet rs = null;

int st;//status

public int registerStudent(Student student) {

con = ConnectionFactory.getConnection();

try {

String query = "insert into "

+ "student "

+ "(name,dob,gender,mailid,mobile_no,password,program,branch,semester) "

+ "values(?,?,?,?,?,?,?,?,?)";

ps = con.prepareStatement(query);

ps.setString(1, student.getName());

ps.setDate(2, student.getDob());

ps.setString(3, student.getGender());

ps.setString(4, student.getMailId());

ps.setString(5, student.getMobileNo());

ps.setString(6, student.getEncPassword());

ps.setString(7, student.getProgram());

ps.setString(8, student.getBranch());

ps.setInt(9, student.getSemester());

st = ps.executeUpdate();

System.out.println("Inserted student " + st);

} catch (MySQLIntegrityConstraintViolationException e) {

/*This exception is throws when user is already

registed with same id, mobileno or mail id*/

e.printStackTrace();

st = -1;

} catch (SQLException e) {

/*Any SqlException occures then this will execute*/

e.printStackTrace();

st = -2;

}

return st;

}

RegisterFrame.java

Receiving response from registerStudent().

RegisterDAO dao = new RegisterDAO();
            int st = dao.registerStudent(student);

            System.out.println(st);
            if (st == 1) {
                JOptionPane.showMessageDialog(null, "Registered Successfully");

            }
            if (st == -1) {
                JOptionPane.showMessageDialog(null, "Already Registered");
            }
            if (st == -2) {
                JOptionPane.showMessageDialog(null, "OOps Unable to Register");
            }

RegisterDAO dao = new RegisterDAO();

int st = dao.registerStudent(student);

System.out.println(st);

if (st == 1) {

JOptionPane.showMessageDialog(null, "Registered Successfully");

}

if (st == -1) {

JOptionPane.showMessageDialog(null, "Already Registered");

}

if (st == -2) {

JOptionPane.showMessageDialog(null, "OOps Unable to Register");

}

Finally Saving data on student table

Student Registration Example — Fig: Registration Done

How to create a registration form in java swing

The above tutorial explains about to create a registration form in java swing.

How to create a registration form in java using netbeans

Follow the above steps to develop registration form

registration form in java source code download

RegistrationExample Download

JTable in Java Swing with Examples

JTable in Java is a swing component, that is used to show data in two dimensional Grid.

It is used to display and edit data in cell format in table

Constructors of JTable

Sr No	Constructor and Description
1	JTable() Construct a Default JTable with default values
2	JTable(int numRows, int numColumns) Construct JTable with numRows and numColumns empty cells using DefaultTableModel
3	JTable(Object[][] rowData, Object[] columnNames) Construct JTable with rowData and provide column names with columnNames
4	JTable(TableModel dm) Construct a JTable with TableModel dm as a data model
5	JTable(TableModel dm, TableColumnModel cm) Constuct JTable with TableModel dm and TableColumnModel cm
6	JTable(TableModel dm, TableColumnModel cm, ListSelectionModel sm) Constuct JTable with TableModel dm and TableColumnModel cm and ListSelectionModel sm

Methods of JTable

Sr No	Methods and Description
1	int getRowCount() Returns Number of Rows in JTable
2	int getRowHeight() Returns Row Height of JTable
3	JTableHeader getTableHeader() Returns JTable Header
4	Object getValueAt(int row, int column) Returns the cell value

All Constructors and method are available at official doc

JTable Java Example to Show Data

package swing;

import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class JTableExamle1 extends JFrame {

    Container container;
    JTable table;

    public JTableExamle1() {
        container = this.getContentPane();
        String[] columnNames = {"First Name", "Last Name", "Age", "Gender", "Mobile No", "Mail Id"};
        Object[][] rowData = {
            {"Ram", "Kumar", 22, "Male", "9434323456", "ramkumar@test.com"},
            {"Mohan", "Nath", 24, "Male", "9445323443", "mohannath@test.com"},
            {"Rita", "Singh", 22, "Female", "1234212347", "ritasingh@test.com"},
            {"Anita", "Sharma", 21, "Female", "7659806587", "anitasharma@test.com"}
        };

        table = new JTable(rowData, columnNames);
        table.setBounds(10, 10, 600, 90);
        container.setLayout(new BorderLayout());
        container.add(table.getTableHeader(), BorderLayout.PAGE_START);
        container.add(table, BorderLayout.CENTER);
    }

    public static void main(String[] args) {
        JTableExamle1 frame = new JTableExamle1();
        frame.setTitle("JTable Example");
        frame.setVisible(true);
        frame.setSize(700, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

package swing;

import java.awt.BorderLayout;

import java.awt.Container;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTable;

public class JTableExamle1 extends JFrame {

Container container;

JTable table;

public JTableExamle1() {

container = this.getContentPane();

String[] columnNames = {"First Name", "Last Name", "Age", "Gender", "Mobile No", "Mail Id"};

Object[][] rowData = {

{"Ram", "Kumar", 22, "Male", "9434323456", "[email protected]"},

{"Mohan", "Nath", 24, "Male", "9445323443", "[email protected]"},

{"Rita", "Singh", 22, "Female", "1234212347", "[email protected]"},

{"Anita", "Sharma", 21, "Female", "7659806587", "[email protected]"}

};

table = new JTable(rowData, columnNames);

table.setBounds(10, 10, 600, 90);

container.setLayout(new BorderLayout());

container.add(table.getTableHeader(), BorderLayout.PAGE_START);

container.add(table, BorderLayout.CENTER);

}

public static void main(String[] args) {

JTableExamle1 frame = new JTableExamle1();

frame.setTitle("JTable Example");

frame.setVisible(true);

frame.setSize(700, 200);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

Without JScroll Pane we have to add Table Header in container.

container.setLayout(new BorderLayout()); container.add(table.getTableHeader(), BorderLayout.PAGE_START); container.add(table, BorderLayout.CENTER);

These lines are used to add header and data.

JScrollPane JTable Example in Java Swing

Here we set container layout to null.

Added JScrollPane to JTable and set bound in JScrollPane.

import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class JTableExamle1 extends JFrame {

    Container container;
    JTable table;
    JScrollPane scrollPane;

    public JTableExamle1() {
        container = this.getContentPane();
        container.setLayout(null);
        String[] columnNames = {"First Name", "Last Name", "Age", "Gender", "Mobile No", "Mail Id"};
        Object[][] rowData = {
            {"Ram", "Kumar", 22, "Male", "9434323456", "ramkumar@test.com"},
            {"Mohan", "Nath", 24, "Male", "9445323443", "mohannath@test.com"},
            {"Rita", "Singh", 22, "Female", "1234212347", "ritasingh@test.com"},
            {"Anita", "Sharma", 21, "Female", "7659806587", "anitasharma@test.com"}
        };
        table = new JTable(rowData, columnNames);
        scrollPane = new JScrollPane(table);
        scrollPane.setBounds(10, 10, 600, 90);
        container.add(scrollPane);
    }

    public static void main(String[] args) {
        JTableExamle1 frame = new JTableExamle1();
        frame.setTitle("JTable Example");
        frame.setVisible(true);
        frame.setSize(700, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

import java.awt.Container;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTable;

public class JTableExamle1 extends JFrame {

Container container;

JTable table;

JScrollPane scrollPane;

public JTableExamle1() {

container = this.getContentPane();

container.setLayout(null);

String[] columnNames = {"First Name", "Last Name", "Age", "Gender", "Mobile No", "Mail Id"};

Object[][] rowData = {

{"Ram", "Kumar", 22, "Male", "9434323456", "[email protected]"},

{"Mohan", "Nath", 24, "Male", "9445323443", "[email protected]"},

{"Rita", "Singh", 22, "Female", "1234212347", "[email protected]"},

{"Anita", "Sharma", 21, "Female", "7659806587", "[email protected]"}

};

table = new JTable(rowData, columnNames);

scrollPane = new JScrollPane(table);

scrollPane.setBounds(10, 10, 600, 90);

container.add(scrollPane);

}

public static void main(String[] args) {

JTableExamle1 frame = new JTableExamle1();

frame.setTitle("JTable Example");

frame.setVisible(true);

frame.setSize(700, 200);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

Setting Column Width in JTable

table.getColumnModel().getColumn(index).setPreferredWidth(size);

is used to set column width.

column index start from zero.

import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class JTableExamle1 extends JFrame {

    Container container;
    JTable table;
    JScrollPane scrollPane;

    public JTableExamle1() {
        container = this.getContentPane();
        container.setLayout(new BorderLayout());
        String[] columnNames = {"First Name", "Last Name", "Age", "Gender", "Mobile No", "Mail Id"};
        Object[][] rowData = {
            {"Ram", "Kumar", 22, "Male", "9434323456", "ramkumar@test.com"},
            {"Mohan", "Nath", 24, "Male", "9445323443", "mohannath@test.com"},
            {"Rita", "Singh", 22, "Female", "1234212347", "ritasingh@test.com"},
            {"Anita", "Sharma", 21, "Female", "7659806587", "anitasharma@test.com"}
        };
        table = new JTable(rowData, columnNames);
        table.getColumnModel().getColumn(2).setPreferredWidth(30);
        table.getColumnModel().getColumn(5).setPreferredWidth(120);
        scrollPane = new JScrollPane(table);
        container.add(scrollPane);
    }

    public static void main(String[] args) {
        JTableExamle1 frame = new JTableExamle1();
        frame.setTitle("JTable Example");
        frame.setVisible(true);
        frame.setSize(700, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

import java.awt.BorderLayout;

import java.awt.Container;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTable;

public class JTableExamle1 extends JFrame {

Container container;

JTable table;

JScrollPane scrollPane;

public JTableExamle1() {

container = this.getContentPane();

container.setLayout(new BorderLayout());

String[] columnNames = {"First Name", "Last Name", "Age", "Gender", "Mobile No", "Mail Id"};

Object[][] rowData = {

{"Ram", "Kumar", 22, "Male", "9434323456", "[email protected]"},

{"Mohan", "Nath", 24, "Male", "9445323443", "[email protected]"},

{"Rita", "Singh", 22, "Female", "1234212347", "[email protected]"},

{"Anita", "Sharma", 21, "Female", "7659806587", "[email protected]"}

};

table = new JTable(rowData, columnNames);

table.getColumnModel().getColumn(2).setPreferredWidth(30);

table.getColumnModel().getColumn(5).setPreferredWidth(120);

scrollPane = new JScrollPane(table);

container.add(scrollPane);

}

public static void main(String[] args) {

JTableExamle1 frame = new JTableExamle1();

frame.setTitle("JTable Example");

frame.setVisible(true);

frame.setSize(700, 200);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

Java JTable Example to find Number of Rows and Columns and Finding JTable Cell Value on Clicking on Cell

Table have method getRowCount() and getColumnCount() to find the number of rows and colums in table.

table.addMouseListener is used to get mouseClick event if mouse it clicked one time them we get table’s getSelectedRow() and getSelectedColumn() to get clicked row and columns.

getValueAt(row,column) is used to get value at cell.

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class JTableExamle3 extends JFrame {

    Container container;
    JTable table;
    JPanel mainPain, tablePane, infoPane;
    JScrollPane pane;
    JLabel row, column, selected;

    public JTableExamle3() {
        container = this.getContentPane();
        String[] columnNames = {"First Name", "Last Name", "Age", "Gender", "Mobile No", "Mail Id"};
        Object[][] rowData = {
            {"Ram", "Kumar", 22, "Male", "9434323456", "ramkumar@test.com"},
            {"Mohan", "Nath", 24, "Male", "9445323443", "mohannath@test.com"},
            {"Rita", "Singh", 22, "Female", "1234212347", "ritasingh@test.com"},
            {"Anita", "Sharma", 21, "Female", "7659806587", "anitasharma@test.com"}
        };

        table = new JTable(rowData, columnNames);

        pane = new JScrollPane(table);
        tablePane = new JPanel();
        tablePane.add(pane);
        mainPain = new JPanel(new GridLayout(2, 1));

        row = new JLabel("No of Rows " + getRows());
        column = new JLabel("No of columns " + getColumns());
        selected = new JLabel();
        infoPane = new JPanel();
        infoPane.add(row);
        infoPane.add(column);
        infoPane.add(selected);
        mainPain.add(tablePane);
        mainPain.add(infoPane);
        container.add(mainPain);

        table.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(final MouseEvent e) {
                if (e.getClickCount() == 1) {
                    JTable jTable = (JTable) e.getSource();
                    int row = jTable.getSelectedRow();
                    int column = jTable.getSelectedColumn();
                    Object valueInCell = jTable.getValueAt(row, column);
                    selected.setText("Value at [" + row + "," + column + "]=" + valueInCell.toString());
                }
            }
        });

    }

    int getRows() {
        return table.getRowCount();
    }

    int getColumns() {
        return table.getColumnCount();
    }

    public static void main(String[] args) {
        JTableExamle3 frame = new JTableExamle3();
        frame.setTitle("JTable Example");
        frame.setVisible(true);
        frame.setSize(700, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

import java.awt.Container;

import java.awt.GridLayout;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTable;

public class JTableExamle3 extends JFrame {

Container container;

JTable table;

JPanel mainPain, tablePane, infoPane;

JScrollPane pane;

JLabel row, column, selected;

public JTableExamle3() {

container = this.getContentPane();

String[] columnNames = {"First Name", "Last Name", "Age", "Gender", "Mobile No", "Mail Id"};

Object[][] rowData = {

{"Ram", "Kumar", 22, "Male", "9434323456", "[email protected]"},

{"Mohan", "Nath", 24, "Male", "9445323443", "[email protected]"},

{"Rita", "Singh", 22, "Female", "1234212347", "[email protected]"},

{"Anita", "Sharma", 21, "Female", "7659806587", "[email protected]"}

};

table = new JTable(rowData, columnNames);

pane = new JScrollPane(table);

tablePane = new JPanel();

tablePane.add(pane);

mainPain = new JPanel(new GridLayout(2, 1));

row = new JLabel("No of Rows " + getRows());

column = new JLabel("No of columns " + getColumns());

selected = new JLabel();

infoPane = new JPanel();

infoPane.add(row);

infoPane.add(column);

infoPane.add(selected);

mainPain.add(tablePane);

mainPain.add(infoPane);

container.add(mainPain);

table.addMouseListener(new MouseAdapter() {

@Override

public void mouseClicked(final MouseEvent e) {

if (e.getClickCount() == 1) {

JTable jTable = (JTable) e.getSource();

int row = jTable.getSelectedRow();

int column = jTable.getSelectedColumn();

Object valueInCell = jTable.getValueAt(row, column);

selected.setText("Value at [" + row + "," + column + "]=" + valueInCell.toString());

}

});

}

int getRows() {

return table.getRowCount();

}

int getColumns() {

return table.getColumnCount();

}

public static void main(String[] args) {

JTableExamle3 frame = new JTableExamle3();

frame.setTitle("JTable Example");

frame.setVisible(true);

frame.setSize(700, 200);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

How to Show Image in JTable Cell

Here we are getting table’s Column Model and setting .setCellRenderer is getDefaultRenderer and setting ImageIcon.class to column.

table.getColumnModel().getColumn(3).setCellRenderer(table.getDefaultRenderer(ImageIcon.class));

import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class JTableExamle4 extends JFrame {

    Container container;
    JTable table;
    JScrollPane pane;

    public JTableExamle4() {
        container = this.getContentPane();
        container.setLayout(new BorderLayout());
        String[] columnNames = {"First Name", "Last Name", "Age", "Photo"};
        Object[][] rowData = {
            {"Ram", "Kumar", 22, new ImageIcon("d://icons/lock.png")},
            {"Mohan", "Nath", 24, new ImageIcon("d://icons/lock.png")},
            {"Rita", "Singh", 22, new ImageIcon("d://icons/lock.png")},
            {"Anita", "Sharma", 21, new ImageIcon("d://icons/lock.png")}
        };

        table = new JTable(rowData, columnNames);
        table.setRowHeight(50);
        table.getColumnModel().getColumn(3).setCellRenderer(table.getDefaultRenderer(ImageIcon.class));
        pane = new JScrollPane(table);
        container.add(pane);
    }

    public static void main(String[] args) {
        JTableExamle4 frame = new JTableExamle4();
        frame.setTitle("JTable Example");
        frame.setVisible(true);
        frame.setSize(700, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

import java.awt.BorderLayout;

import java.awt.Container;

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTable;

public class JTableExamle4 extends JFrame {

Container container;

JTable table;

JScrollPane pane;

public JTableExamle4() {

container = this.getContentPane();

container.setLayout(new BorderLayout());

String[] columnNames = {"First Name", "Last Name", "Age", "Photo"};

Object[][] rowData = {

{"Ram", "Kumar", 22, new ImageIcon("d://icons/lock.png")},

{"Mohan", "Nath", 24, new ImageIcon("d://icons/lock.png")},

{"Rita", "Singh", 22, new ImageIcon("d://icons/lock.png")},

{"Anita", "Sharma", 21, new ImageIcon("d://icons/lock.png")}

};

table = new JTable(rowData, columnNames);

table.setRowHeight(50);

table.getColumnModel().getColumn(3).setCellRenderer(table.getDefaultRenderer(ImageIcon.class));

pane = new JScrollPane(table);

container.add(pane);

}

public static void main(String[] args) {

JTableExamle4 frame = new JTableExamle4();

frame.setTitle("JTable Example");

frame.setVisible(true);

frame.setSize(700, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

How to display data from database in jtable in java using DefaultTableModel

DefaultTableModel is used to create JTable. We are extracting data from database and assigning row to DefaultTableModel and printing it to Frame.

Example: how to display database values in jtable in java

import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class JTableExamle5 extends JFrame {

    Container container;
    JTable table;
    JScrollPane pane;
    StudentDAO dao = new StudentDAO();

    public JTableExamle5() {
        container = this.getContentPane();
        container.setLayout(new BorderLayout());
        DefaultTableModel dm = (DefaultTableModel) dao.fetchBySize(0, 10);
        table = new JTable(dm);
        table.setRowHeight(50);
        pane = new JScrollPane(table);
        container.add(pane);
    }

    public static void main(String[] args) {
        JTableExamle5 frame = new JTableExamle5();
        frame.setTitle("JTable Example");
        frame.setVisible(true);
        frame.setSize(700, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

import java.awt.BorderLayout;

import java.awt.Container;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTable;

import javax.swing.table.DefaultTableModel;

public class JTableExamle5 extends JFrame {

Container container;

JTable table;

JScrollPane pane;

StudentDAO dao = new StudentDAO();

public JTableExamle5() {

container = this.getContentPane();

container.setLayout(new BorderLayout());

DefaultTableModel dm = (DefaultTableModel) dao.fetchBySize(0, 10);

table = new JTable(dm);

table.setRowHeight(50);

pane = new JScrollPane(table);

container.add(pane);

}

public static void main(String[] args) {

JTableExamle5 frame = new JTableExamle5();

frame.setTitle("JTable Example");

frame.setVisible(true);

frame.setSize(700, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.swing.table.DefaultTableModel;


public class StudentDAO {

    Connection con = null;
    PreparedStatement ps = null;
    ResultSet rs = null;
    int st;//status

    public DefaultTableModel fetchBySize(int start, int size) {
        DefaultTableModel model = new DefaultTableModel(new String[]{"Id", "Name", "Gender", "MailId",}, 0);
        con = ConnectionFactory.getConnection();
        try {
            String query = "select * from student";
            System.out.println(query);
            ps = con.prepareStatement(query);
            rs = ps.executeQuery();
            int i = 0;
            while (rs.next()) {
                long id = rs.getLong("id");
                String name = rs.getString("name");
                String author = rs.getString("gender");
                String publication = rs.getString("mailid");
                model.addRow(new Object[]{id, name, author, publication});
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                con.close();
            } catch (SQLException ex) {
                ex.printStackTrace();
            }
        }
        return model;
    }
}

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import javax.swing.table.DefaultTableModel;

public class StudentDAO {

Connection con = null;

PreparedStatement ps = null;

ResultSet rs = null;

int st;//status

public DefaultTableModel fetchBySize(int start, int size) {

DefaultTableModel model = new DefaultTableModel(new String[]{"Id", "Name", "Gender", "MailId",}, 0);

con = ConnectionFactory.getConnection();

try {

String query = "select * from student";

System.out.println(query);

ps = con.prepareStatement(query);

rs = ps.executeQuery();

int i = 0;

while (rs.next()) {

long id = rs.getLong("id");

String name = rs.getString("name");

String author = rs.getString("gender");

String publication = rs.getString("mailid");

model.addRow(new Object[]{id, name, author, publication});

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

con.close();

} catch (SQLException ex) {

ex.printStackTrace();

}

return model;

}

Download mysql-connector-java-5.1.14-bin.jar or any latest jar to connect java with mysql

Fig: **DefaultTableModel to get data From Database**

Editing JTable Cell and using CheckBox and JComboBox in JTable

To make out JTable editable we created MyTableModel that extends AbstractTableModel.

Here we have override methods and one of the method in

public boolean isCellEditable(int row, int col) { return true; }

making true in above method allows user to edit cell value.

To Show JComboBox in table cell TableColumn is used as below.

TableColumn tc = table.getColumnModel().getColumn(4); tc.setCellEditor(new DefaultCellEditor(branchList));

import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableModel;

public class Example6 extends JFrame implements TableModelListener {

    Container container;
    JTable table;
    JScrollPane pane;
    JComboBox<String> branchList;

    public Example6() {
        container = this.getContentPane();
        container.setLayout(new BorderLayout());
        table = new JTable(new MyTableModel());
        table.setRowHeight(50);
        /*Creating combo box*/
        branchList = new JComboBox<String>();
        branchList.addItem("CSE");
        branchList.addItem("IT");
        branchList.addItem("Mech");
        branchList.addItem("Civil");
        branchList.addItem("EEE");
        /*Setting table editor as combo box*/
        TableColumn tc = table.getColumnModel().getColumn(4);
        tc.setCellEditor(new DefaultCellEditor(branchList));
        pane = new JScrollPane(table);
        container.add(pane);
        table.getModel().addTableModelListener(this);
    }

    @Override
    public void tableChanged(TableModelEvent e) {
        int row = e.getFirstRow();
        int column = e.getColumn();
        TableModel model = (TableModel) e.getSource();
        Object data = model.getValueAt(row, column);
        System.out.println("row " + row + " column " + column + " data " + data);
    }

    public static void main(String[] args) {
        Example6 frame = new Example6();
        frame.setTitle("JTable Example");
        frame.setVisible(true);
        frame.setSize(700, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

class MyTableModel extends AbstractTableModel {

    String[] columnNames = {"First Name", "Last Name", "Age", "City", "Branch", "Topper"};
    private Object[][] data = {
        {"Ram", "Kumar", 22, "Delhi", "CSE", new Boolean(true)},
        {"Mohan", "Nath", 24, "Mumbai", "IT", new Boolean(false)},
        {"Rita", "Singh", 22, "Kolkata", "ETC", new Boolean(true)},
        {"Anita", "Sharma", 21, "Bhopal", "MECH", new Boolean(false)}
    };

    public int getColumnCount() {
        return columnNames.length;
    }

    public int getRowCount() {
        return data.length;
    }

    public String getColumnName(int col) {
        return columnNames[col];
    }

    public Object getValueAt(int row, int col) {
        return data[row][col];
    }

    public Class getColumnClass(int c) {
        return getValueAt(0, c).getClass();
    }

    public boolean isCellEditable(int row, int col) {
        return true;
    }

    public void setValueAt(Object value, int row, int col) {
        data[row][col] = value;
        fireTableCellUpdated(row, col);
    }

}

100

import java.awt.BorderLayout;

import java.awt.Container;

import javax.swing.DefaultCellEditor;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTable;

import javax.swing.event.TableModelEvent;

import javax.swing.event.TableModelListener;

import javax.swing.table.AbstractTableModel;

import javax.swing.table.TableColumn;

import javax.swing.table.TableModel;

public class Example6 extends JFrame implements TableModelListener {

Container container;

JTable table;

JScrollPane pane;

JComboBox<String> branchList;

public Example6() {

container = this.getContentPane();

container.setLayout(new BorderLayout());

table = new JTable(new MyTableModel());

table.setRowHeight(50);

/*Creating combo box*/

branchList = new JComboBox<String>();

branchList.addItem("CSE");

branchList.addItem("IT");

branchList.addItem("Mech");

branchList.addItem("Civil");

branchList.addItem("EEE");

/*Setting table editor as combo box*/

TableColumn tc = table.getColumnModel().getColumn(4);

tc.setCellEditor(new DefaultCellEditor(branchList));

pane = new JScrollPane(table);

container.add(pane);

table.getModel().addTableModelListener(this);

}

@Override

public void tableChanged(TableModelEvent e) {

int row = e.getFirstRow();

int column = e.getColumn();

TableModel model = (TableModel) e.getSource();

Object data = model.getValueAt(row, column);

System.out.println("row " + row + " column " + column + " data " + data);

}

public static void main(String[] args) {

Example6 frame = new Example6();

frame.setTitle("JTable Example");

frame.setVisible(true);

frame.setSize(700, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

class MyTableModel extends AbstractTableModel {

String[] columnNames = {"First Name", "Last Name", "Age", "City", "Branch", "Topper"};

private Object[][] data = {

{"Ram", "Kumar", 22, "Delhi", "CSE", new Boolean(true)},

{"Mohan", "Nath", 24, "Mumbai", "IT", new Boolean(false)},

{"Rita", "Singh", 22, "Kolkata", "ETC", new Boolean(true)},

{"Anita", "Sharma", 21, "Bhopal", "MECH", new Boolean(false)}

};

public int getColumnCount() {

return columnNames.length;

}

public int getRowCount() {

return data.length;

}

public String getColumnName(int col) {

return columnNames[col];

}

public Object getValueAt(int row, int col) {

return data[row][col];

}

public Class getColumnClass(int c) {

return getValueAt(0, c).getClass();

}

public boolean isCellEditable(int row, int col) {

return true;

}

public void setValueAt(Object value, int row, int col) {

data[row][col] = value;

fireTableCellUpdated(row, col);

}

Fig: Editing JTable Cell CheckBox and JComboBox in JTable

How to Change Row Color of JTable

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;

public class JTableExample7 extends JFrame {

    Container container;
    JTable table;
    JScrollPane pane;

    public JTableExample7() {
        container = this.getContentPane();
        container.setLayout(new BorderLayout());

        String[] columnNames = {"First Name", "Last Name", "City", "Branch", "Percent"};
        Object[][] rowData = {
            {"Ram", "Kumar", "Delhi", "CSE", 91},
            {"Mohan", "Nath", "Mumbai", "IT", 77},
            {"Rita", "Singh", "Kolkata", "ETC", 66},
            {"Anita", "Sharma", "Bhopal", "MECH", 59},
            {"Sohan", "Gupta", "Kolkata", "ETC", 90},
            {"Ritesh", "Sao", "Delhi", "MECH", 88}
        };
        table = new JTable(rowData, columnNames);
        table.setRowHeight(50);
        table.setDefaultRenderer(Object.class, new MyTableRenderer());
        pane = new JScrollPane(table);
        container.add(pane);
    }

    public static void main(String[] args) {
        JTableExample7 frame = new JTableExample7();
        frame.setTitle("JTable Example");
        frame.setVisible(true);
        frame.setSize(700, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

//Custom DefaultTableCellRenderer
class MyTableRenderer extends DefaultTableCellRenderer {

    // You should override getTableCellRendererComponent
    @Override
    public Component getTableCellRendererComponent(JTable table, Object value,
            boolean isSelected, boolean hasFocus, int row, int column) {

        Component c = super.getTableCellRendererComponent(table, value, isSelected,
                hasFocus, row, column);
        c.setForeground(Color.WHITE);

        if (row % 2 == 0) {
            c.setBackground(Color.LIGHT_GRAY);

        } else {
            c.setBackground(Color.PINK);
        }
        return c;
    }
}

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Component;

import java.awt.Container;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTable;

import javax.swing.table.DefaultTableCellRenderer;

public class JTableExample7 extends JFrame {

Container container;

JTable table;

JScrollPane pane;

public JTableExample7() {

container = this.getContentPane();

container.setLayout(new BorderLayout());

String[] columnNames = {"First Name", "Last Name", "City", "Branch", "Percent"};

Object[][] rowData = {

{"Ram", "Kumar", "Delhi", "CSE", 91},

{"Mohan", "Nath", "Mumbai", "IT", 77},

{"Rita", "Singh", "Kolkata", "ETC", 66},

{"Anita", "Sharma", "Bhopal", "MECH", 59},

{"Sohan", "Gupta", "Kolkata", "ETC", 90},

{"Ritesh", "Sao", "Delhi", "MECH", 88}

};

table = new JTable(rowData, columnNames);

table.setRowHeight(50);

table.setDefaultRenderer(Object.class, new MyTableRenderer());

pane = new JScrollPane(table);

container.add(pane);

}

public static void main(String[] args) {

JTableExample7 frame = new JTableExample7();

frame.setTitle("JTable Example");

frame.setVisible(true);

frame.setSize(700, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

//Custom DefaultTableCellRenderer

class MyTableRenderer extends DefaultTableCellRenderer {

// You should override getTableCellRendererComponent

@Override

public Component getTableCellRendererComponent(JTable table, Object value,

boolean isSelected, boolean hasFocus, int row, int column) {

Component c = super.getTableCellRendererComponent(table, value, isSelected,

hasFocus, row, column);

c.setForeground(Color.WHITE);

if (row % 2 == 0) {

c.setBackground(Color.LIGHT_GRAY);

} else {

c.setBackground(Color.PINK);

}

return c;

}

How to change Column Color of JTable

in above example instead or row use column as below

if (column % 2 == 0) {
            c.setBackground(Color.LIGHT_GRAY);

        } else {
            c.setBackground(Color.PINK);
        }

if (column % 2 == 0) {

c.setBackground(Color.LIGHT_GRAY);

} else {

c.setBackground(Color.PINK);

}

Fig: How to change Column Color of JTable

How to Change Row Color of JTable on Row Select

if (isSelected) {
            c.setBackground(Color.red);
            c.setForeground(Color.WHITE);
            c.setFont(new Font("Verdana", Font.BOLD, 16));
        } else {
            c.setBackground(Color.WHITE);
            c.setForeground(Color.BLACK);
        }

if (isSelected) {

c.setBackground(Color.red);

c.setForeground(Color.WHITE);

c.setFont(new Font("Verdana", Font.BOLD, 16));

} else {

c.setBackground(Color.WHITE);

c.setForeground(Color.BLACK);

}

**Fig : Change Column Color of JTable on Row Select**

How to Change Cell Color of JTable on hasFocus

 if (hasFocus) {
            c.setBackground(Color.BLUE);
            c.setForeground(Color.WHITE);
            c.setFont(new Font("Verdana", Font.BOLD, 16));
        } else {
            c.setBackground(Color.WHITE);
            c.setForeground(Color.BLACK);
        }

if (hasFocus) {

c.setBackground(Color.BLUE);

c.setForeground(Color.WHITE);

c.setFont(new Font("Verdana", Font.BOLD, 16));

} else {

c.setBackground(Color.WHITE);

c.setForeground(Color.BLACK);

}

Fig: Change Cell Color of JTable on hasFocus

How to Color Specific Cell Based on value in JTable

prepareRenderer is used to access specific cell in JTable as below

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;

public class JTableExample7 extends JFrame {

    Container container;
    JTable table;
    JScrollPane pane;

    public JTableExample7() {
        container = this.getContentPane();
        container.setLayout(new BorderLayout());

        String[] columnNames = {"First Name", "Last Name", "City", "Branch", "Percent"};
        Object[][] rowData = {
            {"Ram", "Kumar", "Delhi", "CSE", 91},
            {"Mohan", "Nath", "Mumbai", "IT", 77},
            {"Rita", "Singh", "Kolkata", "ETC", 66},
            {"Anita", "Sharma", "Bhopal", "MECH", 59},
            {"Sohan", "Gupta", "Kolkata", "ETC", 90},
            {"Ritesh", "Sao", "Delhi", "MECH", 88}
        };
        table = new JTable(rowData, columnNames) {
            @Override
            public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
                Component c = super.prepareRenderer(renderer, row, column);
                Object obj = getModel().getValueAt(row, column);
                if (obj.toString().equalsIgnoreCase("MECH")) {
                    c.setBackground(Color.GREEN);

                } else {
                    c.setBackground(Color.WHITE);
                }

                return c;
            }
        };
        pane = new JScrollPane(table);

        container.add(pane);
    }

    public static void main(String[] args) {
        JTableExample7 frame = new JTableExample7();
        frame.setTitle("JTable Example");
        frame.setVisible(true);
        frame.setSize(700, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

public class MyTable extends JTable {

    public MyTable(TableModel model) {
        super(model);
    }

    @Override
    public Component prepareRenderer(TableCellRenderer renderer, int rowIndex, int vColIndex) {
        Component rComp = super.prepareRenderer(renderer, rowIndex, vColIndex);
        if (getModel() != null) {
            Client client = ((ProfitAbilityTableModel) getModel()).getClient(rowIndex);
            if (client.getExpected() == client.getReceived()) {
                rComp.setBackground(new Color(139, 255, 182));
            } else {
                rComp.setBackground(new Color(255, 139, 147));
            }
        }

        return rComp;
    }
}

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Component;

import java.awt.Container;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTable;

import javax.swing.table.TableCellRenderer;

import javax.swing.table.TableModel;

public class JTableExample7 extends JFrame {

Container container;

JTable table;

JScrollPane pane;

public JTableExample7() {

container = this.getContentPane();

container.setLayout(new BorderLayout());

String[] columnNames = {"First Name", "Last Name", "City", "Branch", "Percent"};

Object[][] rowData = {

{"Ram", "Kumar", "Delhi", "CSE", 91},

{"Mohan", "Nath", "Mumbai", "IT", 77},

{"Rita", "Singh", "Kolkata", "ETC", 66},

{"Anita", "Sharma", "Bhopal", "MECH", 59},

{"Sohan", "Gupta", "Kolkata", "ETC", 90},

{"Ritesh", "Sao", "Delhi", "MECH", 88}

};

table = new JTable(rowData, columnNames) {

@Override

public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {

Component c = super.prepareRenderer(renderer, row, column);

Object obj = getModel().getValueAt(row, column);

if (obj.toString().equalsIgnoreCase("MECH")) {

c.setBackground(Color.GREEN);

} else {

c.setBackground(Color.WHITE);

}

return c;

}

};

pane = new JScrollPane(table);

container.add(pane);

}

public static void main(String[] args) {

JTableExample7 frame = new JTableExample7();

frame.setTitle("JTable Example");

frame.setVisible(true);

frame.setSize(700, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public class MyTable extends JTable {

public MyTable(TableModel model) {

super(model);

}

@Override

public Component prepareRenderer(TableCellRenderer renderer, int rowIndex, int vColIndex) {

Component rComp = super.prepareRenderer(renderer, rowIndex, vColIndex);

if (getModel() != null) {

Client client = ((ProfitAbilityTableModel) getModel()).getClient(rowIndex);

if (client.getExpected() == client.getReceived()) {

rComp.setBackground(new Color(139, 255, 182));

} else {

rComp.setBackground(new Color(255, 139, 147));

}

return rComp;

}

Fig: **How to Color Specific Cell Based on value in JTable**

Java program to add two numbers

java program to add two numbers is a very simple program.

It is required by learners How can we add two numbers.

We will start with simple addition and try to cover additional things here.

Java program to add two numbers

Steps to add two numbers

Store two numbers in two variables
Add both variables and store in another variable
Print the result

public class Addition {

    public static void main(String[] args) {
        int a = 5;
        int b = 6;
        int sum = a + b;
        System.out.println("Addition is " + sum);
    }
}

public class Addition {

public static void main(String[] args) {

int a = 5;

int b = 6;

int sum = a + b;

System.out.println("Addition is " + sum);

}

Addition is 11

1	Addition is 11

Here we take a=5 and a=6 two variables

added a and b and stored in variable sum

printed the sum in consol.

Fig: Addition of two numbers in Notepad++

Fig: Compilation and run of Addition program

Addition of two numbers in java

Above we add two integer numbers.

Here lets take two decimal numbers in java we represent decimal number in float and double

Addition of two decimal numbers in java

public class Addition {

    public static void main(String[] args) {
        double a = 5.6;
        double b = 8.9;
        double sum = a + b;
        System.out.println("Addition is " + sum);
    }
}

public class Addition {

public static void main(String[] args) {

double a = 5.6;

double b = 8.9;

double sum = a + b;

System.out.println("Addition is " + sum);

}

Addition is 14.5

1	Addition is 14.5

The process is same only we changed data types.

Addition of two numbers in java

Here we are considering two numbers one is integer and another is double.

public class Addition {

    public static void main(String[] args) {
        int a = 6;
        double b = 15.9;
        double sum = a + b;
        System.out.println("Addition is " + sum);
    }
}

public class Addition {

public static void main(String[] args) {

int a = 6;

double b = 15.9;

double sum = a + b;

System.out.println("Addition is " + sum);

}

Addition is 21.9

1	Addition is 21.9

Here a is integer data type and b is double data type.

For addition a is automatically promoted to double data type by the compiler the addition is performed.

Whenever two or more variable of different data types take part in any operation then a lower data type is always converted to higher data type.

This automatic conversion is done by compiler and the process in known as widening.

Addition of short numbers in java

public class Addition {

    public static void main(String[] args) {
        short a = 12;
        short b = 15;
        int sum = a + b;
        System.out.println("Addition is " + sum);
    }
}

public class Addition {

public static void main(String[] args) {

short a = 12;

short b = 15;

int sum = a + b;

System.out.println("Addition is " + sum);

}

Addition is 27

1	Addition is 27

Here variable a and b both are short type.

While adding two short numbers it is converted to integer and the result is stored in integer data type.

Both byte and short data types are converted to an integer.

Sum of two numbers in java using method

public class Addition {

    public static void main(String[] args) {
        System.out.println("Addition of two numbers");
        int sum1 = Addition.sum(5, 7);
        System.out.println("Sum is " + sum1);
        Addition a = new Addition();
        a.add1();
        int sum2 = a.add2();
        System.out.println("Addition is " + sum2);
        a.add3(5.7, 6.7);
        double sum3 = a.add4(34.2, 44.2);
        System.out.println("Addition is " + sum3);
    }

    public static int sum(int a, int b) {
        return a + b;
    }

    public void add1() {
        int a = 5;
        int b = 7;
        int sum = a + b;
        System.out.println("Sum =" + sum);
    }

    public int add2() {
        int a = 5;
        int b = 7;
        int sum = a + b;
        return sum;
    }

    public void add3(double num1, double num2) {
        double sum = num1 + num2;
        System.out.println("Sum =" + sum);
    }

    public double add4(double num1, double num2) {
        double sum = num1 + num2;
        return sum;
    }

}

public class Addition {

public static void main(String[] args) {

System.out.println("Addition of two numbers");

int sum1 = Addition.sum(5, 7);

System.out.println("Sum is " + sum1);

Addition a = new Addition();

a.add1();

int sum2 = a.add2();

System.out.println("Addition is " + sum2);

a.add3(5.7, 6.7);

double sum3 = a.add4(34.2, 44.2);

System.out.println("Addition is " + sum3);

}

public static int sum(int a, int b) {

return a + b;

}

public void add1() {

int a = 5;

int b = 7;

int sum = a + b;

System.out.println("Sum =" + sum);

}

public int add2() {

int a = 5;

int b = 7;

int sum = a + b;

return sum;

}

public void add3(double num1, double num2) {

double sum = num1 + num2;

System.out.println("Sum =" + sum);

}

public double add4(double num1, double num2) {

double sum = num1 + num2;

return sum;

}

Addition of two numbers
Sum is 12
Sum =12
Addition is 12
Sum =12.4
Addition is 78.4

Addition of two numbers

Sum is 12

Sum =12

Addition is 12

Sum =12.4

Addition is 78.4

In the above program sum() is a static method so we called it with Class name.

add1(), add2(), add3() and add4() are non static so we called by object of class.

Methods are with and without argument and with and without return type.

Write the definition of a method add, which receives two integer parameters and returns their sum.

public class Addition {

    public static void main(String[] args) {
        System.out.println("Addition of two numbers");
        Addition a = new Addition();
        int sum1 = a.add(12, 16);
        System.out.println("Sum is " + sum1);
    }

    public int add(int a, int b) {
        return a + b;
    }

}

JComboBox Constructors

Methods of JComboBox

JComboBox add and show items

Examples of JComboBox

JComboBox actionlistener get selected item and get selected index

jcombobox get selected item example

JComboBox set selected item and set selected index

jcombobox get selected item using ItemListener

JComboBox Example ItemListener

JComboBox Show Image in combo box using ListCellRenderer and ItemListner

How to use combobox in java netbeans

Read More

Steps to develop Registration Form in Java Swing is as below

1 Create User Interface using JFrame

A. Create a basic structure for frame

2 Collect all data in Model sent from UI

3 Validate and Process Received data

Processing Data

4 Saving data to MySql Database

How to create a registration form in java swing

How to create a registration form in java using netbeans

registration form in java source code download

Read More

Constructors of JTable

Methods of JTable

JTable Java Example to Show Data

JScrollPane JTable Example in Java Swing

Setting Column Width in JTable

Java JTable Example to find Number of Rows and Columns and Finding JTable Cell Value on Clicking on Cell

How to Show Image in JTable Cell

How to display data from database in jtable in java using DefaultTableModel

Example: how to display database values in jtable in java

Editing JTable Cell and using CheckBox and JComboBox in JTable

How to Change Row Color of JTable

How to change Column Color of JTable

How to Change Row Color of JTable on Row Select

How to Change Cell Color of JTable on hasFocus

How to Color Specific Cell Based on value in JTable

Read More

Java program to add two numbers

Addition of two numbers in java

Addition of two decimal numbers in java

Addition of two numbers in java

Addition of short numbers in java

Sum of two numbers in java using method

Write the definition of a method add, which receives two integer parameters and returns their sum.