// the code below moves a ball across the screen
// first the init function sets the size of the applet window
// then the paint function which is called automatically when the
// applet opens up is called

// the window name here is g - you named it as parametr to paint function

// you are moving ball across the screen from 0 to 800 - jumping by 20

// fillOval fills a ball at x,y with size h,v

// first we draw the ball in red- make the computer count a while
// then draw it in white to erase it

// we need to make computer count - this is the velocity - play with this number

import java.awt.*;
import javax.swing.*;


public class BallBounce extends JApplet
 {

	 public void init()
	  {setSize(800,600);
   }

	 public void paint (Graphics g)
	   {
	    for (int x=0; x <= 800; x+=20)
	      {g.setColor(Color.red);
		   g.fillOval(x,150,10,10);

	       for (int y=1; y<=100000000;y++);
	       g.setColor(Color.white);
			  g.fillOval(x,150,10,10);

	   }
   }
}