java Archives - Page 3 of 6

Thread stop method in Java

February 4, 2023February 2, 2023 by manish

In java, stop() method kills/terminates the currently executing thread.

class A extends Thread {
    public void run() {
        for (int i = 1; i <= 5; i++) {
            if (i == 3) 
                stop();
            System.out.println("A" + i);
        }
        System.out.println("Exit from A");
    }
}
public class TestMain {
    public static void main(String args[]) {
        A a = new A();
        a.start();
    }
}

class A extends Thread {

public void run() {

for (int i = 1; i <= 5; i++) {

if (i == 3)

stop();

System.out.println("A" + i);

}

System.out.println("Exit from A");

}

public class TestMain {

public static void main(String args[]) {

A a = new A();

a.start();

}

Result

A1
A2

Description: in the above program, when value of variable i=3 then stop() method terminates the curently executing thread and come out of the loop.

Basics of Applet in Java

February 4, 2023February 2, 2023 by manish

The Java Applet is a special Java program that are primarily used in a internet programming. Applet program runs on a web browser at client side. Applet program are used to make the web site more dynamic. Applet program embedded in a HTML page and hosted on a web server. Applet Skeleton/ Structure Applet skeleton … Read more

Java Program Structure and First Program

January 30, 2023January 30, 2023 by manish

Here we will see the structure of the java program and create a java first program in notepad and run it 1. Structure of Java Program Let’s see the basic structure of the java program

class className {

    //main method of java program
    public static void main(String args[]) {
        //program execution starts from main method
    }
}

class className {

//main method of java program

public static void main(String args[]) {

//program execution starts from main method

}

Here: class- is write to create a class. class_name – is the name of the class. It is an … Read more

Character Stream I/O in Java

January 27, 2023January 26, 2023 by manish

In a java programming, like a Byte stream Character stream is also used for input-output for 16 bit. But Byte streams are used to perform input and output of 8-bit. Most common Character streams classes are, FileReader and FileWriter. FileReader- FileReader uses for reads two bytes at a time. FileWriter– FileWriter uses for writes two bytes at a … Read more

Even or odd program in java

January 25, 2023January 24, 2023 by manish

The number which is divisible by 2 is known as even number and the number which is not divisible by 2 is odd number. in programming we use % operator to check divisibility. The % operator returns the remainder of division. If a number is completely divisible its remainder is 0. So any number is … Read more

String reverse program in java

September 16, 2023January 20, 2023 by manish

In Java, you can reverse a string in several ways. Here are three common methods to reverse a string: String reverse program in java using StringBuilder

public class StringReverseExample {
    public static void main(String[] args) {
        String original = "Hello, World!";
        StringBuilder reversed = new StringBuilder(original).reverse();
        String reversedString = reversed.toString();
        System.out.println("Reversed string: " + reversedString);
    }
}

public class StringReverseExample {

public static void main(String[] args) {

String original = "Hello, World!";

StringBuilder reversed = new StringBuilder(original).reverse();

String reversedString = reversed.toString();

System.out.println("Reversed string: " + reversedString);

}

This program uses the StringBuilder class, which is a mutable sequence of characters. Here’s how it works: Using a loop to reverse the string character by character:

public class StringReverseExample {
    public static void main(String[] args) {
        String original = "Hello, World!";
        String reversed = reverseString(original);
        System.out.println("Reversed string: " + reversed);
    }

    public static String reverseString(String str) {
        StringBuilder reversed = new StringBuilder();
        for (int i = str.length() - 1; i >= 0; i--) {
            reversed.append(str.charAt(i));
        }
        return reversed.toString();
    }
}

public class StringReverseExample {

public static void main(String[] args) {

String original = "Hello, World!";

String reversed = reverseString(original);

System.out.println("Reversed string: " + reversed);

}

public static String reverseString(String str) {

StringBuilder reversed = new StringBuilder();

for (int i = str.length() - 1; i >= 0; i--) {

reversed.append(str.charAt(i));

}

return reversed.toString();

}

Thread suspend() and resume() method in Java

January 24, 2023January 20, 2023 by manish

suspend() : This method suspend a thread for sometime but do not kill/terminate it. resume() : This method revives the suspended thread.

class A extends Thread {
    public void run() {
        for (int i = 1; i <= 5; i++) {
            System.out.println("A" + i);
        }
        System.out.println("Exit from A");
    }
}
class B extends Thread {
    public void run() {
        for (int i = 1; i <= 5; i++) {
            System.out.println("B" + i);
        }
        System.out.println("Exit from B");
    }
}
public class TestMain {
    public static void main(String args[]) {
        A a = new A();
        B b = new B();
        a.start();
        b.start();
        a.suspend();
        a.resume();
    }
}

class A extends Thread {

public void run() {

for (int i = 1; i <= 5; i++) {

System.out.println("A" + i);

}

System.out.println("Exit from A");

}

class B extends Thread {

public void run() {

for (int i = 1; i <= 5; i++) {

System.out.println("B" + i);

}

System.out.println("Exit from B");

}

public class TestMain {

public static void main(String args[]) {

A a = new A();

B b = new B();

a.start();

b.start();

a.suspend();

a.resume();

}

A1
A2
A3
A4
A5
Exit from A
B1
B2
B3
B4
B5
Exit from B

Exit from A

Exit from B

Java Applet Example

January 21, 2023January 20, 2023 by manish

To run applets we use appletviewer . An appletviewer is command line program to invoke an applet program from command line. Here we will see how to run applet from applet viewer Example : Write a simple applet program to print “ Hello Students”

import java.applet.Applet;
import java.awt.Graphics;

/* 
<applet code="APdemo.class" width="300" height="300"> 
</applet> 
*/

public class APdemo extends Applet {
    String s = "Hello Students";
    public void paint(Graphics g) {
        g.drawString(s, 100, 100); // print string at 100*100 pixel location
    }

}

import java.applet.Applet;

import java.awt.Graphics;

</applet>

public class APdemo extends Applet {

String s = "Hello Students";

public void paint(Graphics g) {

g.drawString(s, 100, 100); // print string at 100*100 pixel location

}

Compile Save & Run: Save this file with APDemo.java name. Compile : … Read more

Exception Handling try catch finally blocks in Java

January 12, 2023January 11, 2023 by manish

What is try block A try block is used to surround a set of statements where exceptions may occur. A try block used with catch and finally block Also Read Exception Handling in Java: Hierarchy Example and Types What is a catch block A catch block is created followed by a try block. Whenever an … Read more