import java.awt.*; 
import javax.swing.*; 
// Applet that shows annimation
// repainr command just starts the paint method again
public class Applet4 extends JApplet

{
Thread t = new Thread();;
int a=0;

public void init() 
{
Font font = new Font("Helvetica", Font.BOLD, 34);
}

public void paint(Graphics g)
{


a=a+1;
g.setColor(Color.red);
g.fillOval(a,a,20,20);
try{t.sleep(100);} catch(Exception e){}
g.setColor(Color.white);
g.fillOval(a,a,20,20);
if(a<300)repaint();
}

}