// Bouncing Ball or Circle Swing
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class BC extends JFrame
{
JFrame f;
JPanel p;
public BC()
{
f=new JFrame();
p=new JPanel()
{
int x=150;
int y=50;
int r=50;
int dx=11;
int dy=7;
public void paint(Graphics g)
{
Float r2,g1,b;
Random r1=new Random();
r2=r1.nextFloat();
g1=r1.nextFloat();
b=r1.nextFloat();
Color c=new Color(r2,g1,b);
g.setColor(c);
super.paintComponent(g);
g.fillOval(x-r,y-r,r*2,r*2);
repaint();
Rectangle bounds=getBounds();
if((x-r+dx<0) || (x+r+dx > bounds.width))
dx=-dx;
if((y-r+dy<0) || (y+r+dy > bounds.height))
dy=-dy;
x+=dx;
y+=dy;
try
{
Thread.sleep(10);
}
catch(InterruptedException e)
{
}
}
};
f.add(p);
f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
f.setSize(300,300);
f.setVisible(true);
}
public static void main(String args[])
{
new BC();
}
}
