import java.applet.Applet;
import java.awt.*;
public class Tolm1 extends Applet{
  public void paint(Graphics g){
    for(int y=40; y<240; y=y+2){
    
      for(int x=40; x<44; x=x+2){
      
      g.setColor(Color.black);       //joonistatakse must ring
      g.drawOval(x, y, 20, 20);
      try{Thread.sleep(50);}catch(Exception e){} //oodatakse veidi
      g.setColor(Color.white);       //ning kustutatakse see
      g.drawOval(x, y, 20, 20);     //valgega üle joonistades
      }
    
   }
 }
 public static void main(String[] argumendid){
  Frame f=new Frame();
  f.add(new Tolm1());
  f.setSize(300, 300);
  f.setVisible(true);
 }
}

    
 
   // for(int z=240; z>40; z=z-2){
     // g.setColor(Color.black);       //joonistatakse must ring
     // g.drawOval(z, 90, 20,20);
      //try{Thread.sleep(50);}catch(Exception e){} //oodatakse veidi
      //g.setColor(Color.white);       //ning kustutatakse see
      //g.drawOval(z, 90, 20, 20); 
   
    //}