import java.lang.*;
import java.awt.*;
import java.awt.Graphics.*;

public class Ringliigub extends Canvas{
	     int i;
	     int j;
	public void paint(Graphics g){
		g.drawRect(84,84,331,331);
		j=85;
		while(j>0){
			for(int i=235; i<385; i++){
      	  g.setColor(Color.black);
       	  g.drawOval(i, j, 30, 30);
       	  try{Thread.sleep (30); } catch(Exception viga){}
       	  g.setColor(Color.yellow);
       	  g.drawOval(i, j, 30, 30);
	        j++;
         }
         for(int i=385; i>235; i--){
      	  g.setColor(Color.black);
       	  g.drawOval(i, j, 30, 30);
       	  try{Thread.sleep (30); } catch(Exception viga){}
       	  g.setColor(Color.green);
       	  g.drawOval(i, j, 30, 30);
	        j++;
         }
         for(int i=235; i>85; i--){
      	  g.setColor(Color.black);
       	  g.drawOval(i, j, 30, 30);
       	  try{Thread.sleep (30); } catch(Exception viga){}
       	  g.setColor(Color.blue);
       	  g.drawOval(i, j, 30, 30);
	        j--;
         }
         for(int i=85; i<235; i++){
      	  g.setColor(Color.black);
       	  g.drawOval(i, j, 30, 30);
       	  try{Thread.sleep (30); } catch(Exception viga){}
       	  g.setColor(Color.red);
       	  g.drawOval(i, j, 30, 30);
	        j--;
         }
      }         

    }
	
	public static void main(String args[]){
		Frame	f=new Frame ("Liikuv ring");
		f.setLayout(new BorderLayout());
		f.setLocation (100,100);
		f.setSize (500,500);
		f.setVisible (true);
		
		Ringliigub r = new Ringliigub();	
		f.add(r, BorderLayout.CENTER);		
		f.show();
	}
}