import java.awt.*;
public class kolmas extends Frame implements Runnable{
 Pall2[] pallid;
  public void Loim2(){
     pallid=new Pall2[5];
    for(int i=0; i<pallid.length; i++)
         pallid[i]=new Pall2();
       setSize(200, 200);
       setVisible(true);
       new Thread(this).start();
        }
       public void joonista(){
          Image pilt=createImage(200, 200);
          Graphics piltg=pilt.getGraphics();
             for(int i=0; i<pallid.length; i++){
             piltg.drawOval(pallid[i].x()-10, pallid[i].y()-10, 20, 20);
             }
             this.getGraphics().drawImage(pilt, 0, 0, this);
       }
       public void run(){
              while(true){
                   joonista();
                   Thread.yield();
                   try{Thread.sleep(100);
                   }catch(Exception e){}
                   }
                   }
       public static void main(String argumendid[]){
          new kolmas();
           }}

       class Pall2 extends Thread{
         double x=200, y=200, dx, dy;
         int vasak=20, ulal=50, parem=200, all=200;
           public Pall2(){
                dx=5*Math.random();
                dy=5*Math.random();
                    start();  }
                      public int x(){
                         return (int)x;
                           }
                      public int y(){
                         return (int)y;
                         }
                      public void run(){
                         setPriority(Thread.NORM_PRIORITY-2);
                             while(true){
                               if(x>parem)dx=-Math.abs(dx);
                               if(y>all)dy=-Math.abs(dy);
                               if(x<vasak)dx=Math.abs(dx);
                               if(y<ulal)dy=Math.abs(dy);
                               x+=dx;
                               y+=dy;
                               yield();
                               try{Thread.sleep(100);
                               }catch(Exception e){}
                                   }
}}