Bouncing Ball Program in Java Using Applet

Write a java program using an applet for bouncing balls. the ball should change its colour for each bounce. Bouncing. Ball Program in Java Using Applet with source code or How to create a bouncing ball animation. How to make a bouncing ball in java or java bouncing balls collision detection or multiple bouncing balls java or moving ball program in java.

Simple Bouncing ball animation in Java using Applet. This is a simple GUI(Graphical User Interface) Animation. In this animation, 4 Balls with different colours (Red, Blue, Magenta, and Yellow) that are Bouncing randomly in a square. They are actually moving in a square so basically Bouncing ball animation in Applet.

We are using a "For Loop" and running this "For Loop" Infinite and changing their Ovels position and some values and repainting all four balls in a new place so in this way, all four ball looks like they are moving without changing their colour. We also use some Events all events are below.

mouseExited
mouseReleased
mouseEntered
mousePressed
mouseClicked

Check this first so you can run the Bouncing ball animation in Applet very easily without any errors and without any problems How to Run Java Applets and Swing Using Command-Line.

Bouncing Ball Program in Java Using Applet

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
//

/* Program By Ghanendra Yadav
    Visit http://www.programmingwithbasics.com/
*/
public class BOUNCINGBALLS extends Applet implements MouseListener, Runnable {
    Thread t = null;
    int x1 = 10, x2 = 10, x3 = 10, x4 = 10;
    int y1 = 300, y2 = 300, y3 = 300, y4 = 300;
    int flagx1, flagy1, flagx2, flagy2;
    int flagx3, flagy3, flagx4, flagy4;

    public void init() {
        addMouseListener(this);
    }
    public void mouseExited(MouseEvent me) {}
    public void mouseReleased(MouseEvent me) {}
    public void mouseEntered(MouseEvent me) {}
    public void mousePressed(MouseEvent me) {}
    public void mouseClicked(MouseEvent me) {}

    public void start() {
        t = new Thread(this);
        t.start();
    }

    public void run() {
        for (;;) {
            try {
                repaint();
                if (y1 <= 50)
                    flagx1 = 0;
                else if (y1 >= 300)
                    flagx1 = 1;
                if (x1 <= 10)
                    flagy1 = 0;
                else if (x1 >= 400)
                    flagy1 = 1;
                if (y2 <= 50)
                    flagx2 = 0;
                else if (y2 >= 300)
                    flagx2 = 1;
                if (x2 <= 10)
                    flagy2 = 0;
                else if (x2 >= 400)
                    flagy2 = 1;
                if (y3 <= 50)
                    flagx3 = 0;
                else if (y3 >= 300)
                    flagx3 = 1;
                if (x3 <= 10)
                    flagy3 = 0;
                else if (x3 >= 400)
                    flagy3 = 1;
                if (y4 <= 50)
                    flagx4 = 0;
                else if (y4 >= 300)
                    flagx4 = 1;
                if (x4 <= 10)
                    flagy4 = 0;
                else if (x4 >= 400)
                    flagy4 = 1;
                Thread.sleep(10);
            } catch (InterruptedException e) {}
        }
    }
    public void paint(Graphics g) {
        g.drawRect(10, 50, 410, 270);

        g.setColor(Color.blue);
        g.fillOval(x1, y1, 20, 20);
        if (flagx1 == 1)
            y1 -= 2;
        else if (flagx1 == 0)
            y1 += 2;
        if (flagy1 == 0)
            x1 += 4;
        else if (flagy1 == 1)
            x1 -= 4;
        g.setColor(Color.red);
        g.fillOval(x2, y2, 20, 20);
        if (flagx2 == 1)
            y2 -= 4;
        else if (flagx2 == 0)
            y2 += 4;
        if (flagy2 == 0)
            x2 += 3;
        else if (flagy2 == 1)
            x2 -= 3;
        g.setColor(Color.yellow);
        g.fillOval(x3, y3, 20, 20);
        if (flagx3 == 1)
            y3 -= 6;
        else if (flagx3 == 0)
            y3 += 6;
        if (flagy3 == 0)
            x3 += 2;
        else if (flagy3 == 1)
            x3 -= 2;
        g.setColor(Color.magenta);
        g.fillOval(x4, y4, 20, 20);
        if (flagx4 == 1)
            y4 -= 5;
        else if (flagx4 == 0)
            y4 += 5;
        if (flagy4 == 0)
            x4 += 1;
        else if (flagy4 == 1)
            x4 -= 1;
    }
}