Slip 3 - B) Write a java program using applet for bouncing ball, for each bounce color of ball should change randomly.

Solution:

import java.awt.*;

import java.applet.*;

public class BounceBall extends Applet implements Runnable

{

int x,y;

int dy;

 

public void init()

{

x=140;

y=40;

dy=30;

Thread t=new Thread(this);

t.start();

}

public void run()

{

while(true)

{

if(y<40||y>260)

{

dy=-dy;

}

y=y+dy;

try

{

Thread.sleep(800);

}

catch(Exception e){}

repaint();

}

}

public void paint(Graphics g)

{

g.fillRect(10,10,330,300);

if(y>260)

g.setColor(new Color((int)(Math.random() * 1000)));

else

g.setColor(Color.red);

g.fillOval(x,y,30,30);

}

}