import java.applet.Applet;
import java.awt.*;
public class LiikuvRing extends Applet{
  public void paint(Graphics g){
    for(int x=40; x<240; x=x+2){
      g.setColor(Color.black);       //joonistatakse must ring
      g.drawOval(x, 90, 20, 20);
      try{Thread.sleep(50);}catch(Exception e){} //oodatakse veidi
      g.setColor(Color.white);       //ning kustutatakse see
      g.drawOval(x, 90, 20, 20);     //valgega üle joonistades
    }
  }
}