As we have already learned about applet and applet life cycle.
Next we will create a simple calculator program in java using applet.
Java applet program for calculator is as below
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import java.awt.*; import java.awt.event.*; import java.applet.*; /* <applet code="Calculator" width="700" height="200"> </applet>*/ public class Calculator extends Applet implements ActionListener { String msg = ""; TextField t1, t2, t3; Button b1, b2, b3, b4; Label l1, l2, l3; public void init() { l1 = new Label("First Number"); add(l1); t1 = new TextField(15); add(t1); l2 = new Label("Second Number"); add(l2); t2 = new TextField(15); add(t2); l3 = new Label("Result"); add(l3); t3 = new TextField(15); add(t3); b1 = new Button("ADD"); add(b1); b1.addActionListener(this); b2 = new Button("SUB"); add(b2); b2.addActionListener(this); b3 = new Button("MULT"); add(b3); b3.addActionListener(this); b4 = new Button("DIV"); add(b4); b4.addActionListener(this); } public void actionPerformed(ActionEvent e) { if (e.getSource() == b1) { int x = Integer.parseInt(t1.getText()); int y = Integer.parseInt(t2.getText()); int sum = x + y; t3.setText(" " + sum); } if (e.getSource() == b2) { int x = Integer.parseInt(t1.getText()); int y = Integer.parseInt(t2.getText()); int sub = x - y; t3.setText(" " + sub); } if (e.getSource() == b3) { int x = Integer.parseInt(t1.getText()); int y = Integer.parseInt(t2.getText()); int mul = x * y; t3.setText(" " + mul); } if (e.getSource() == b4) { int x = Integer.parseInt(t1.getText()); int y = Integer.parseInt(t2.getText()); int div = x / y; t3.setText(" " + div); } showStatus(" text & button example"); repaint(); } } |
Below is the output of the calculator program in java
