import java.awt.*;
import java.applet.Applet;
public class Ringid extends Applet{

public void paint (Graphics g) {
  	for (int y=0; y<20; y=y+1){
   for (int x= 50; x<150; x=x+10){ 
	g.setColor (Color.red);
	g.drawOval (100, 100, x, x);
	
   g.setColor (Color.blue);
	g.drawOval (300, 300, x, x);
	
   g.setColor (Color.yellow);
	g.drawOval (600, 100, x, x);
	
	try{Thread.sleep(500);}catch(Exception e){}
    g.setColor(Color.white);
    g.fillRect(0, 0, getSize().width, getSize().height);
     
    
    
    
    }
	}
}
}