import java.awt.*;
import java.applet.Applet;

public class Pallike extends Applet implements Runnable{
 Pall2 p;
 Image pilt;
 public Pallike(){
    p=new Pall2();
   new Thread(this).start();
 }
 
 public void joonista(){
  if(pilt==null) pilt=createImage(220, 220);
  if(pilt!=null){
   Graphics piltg=pilt.getGraphics();
   piltg.setColor(Color.white);
   piltg.fillRect(0, 0, 220, 220);
   piltg.setColor(Color.black);
   piltg.drawLine(90, 0, 90, 95);
   piltg.drawOval(p.x()-10, p.y()-10, 20, 20);
   this.getGraphics().drawImage(pilt, 0, 0, this);
  }
 }
 public void run(){
   while(true){
     joonista();
     Thread.yield();
     try{Thread.sleep(20);}catch(Exception e){}
   }
 }
 public static void main(String argumendid[]){
   Frame f=new Frame("Pallikesed");
   f.add(new Pallike());
   f.setSize(220, 220);
   f.setVisible(true);
 }
}

class Pall2 extends Thread{
  double x=100, y=100, dx, dy;
  int vasak=5, ulal=10, parem=200, all=180, kesk=100;
  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);
	  if(y<kesk && x<kesk && x>kesk-10 && dx<0)dx=Math.abs(dx);
      else if(y<kesk && x<kesk && x>kesk-20 && dx>0)dx=-Math.abs(dx);
	  x+=dx;
      y+=dy;
      yield();
      try{Thread.sleep(20);}catch(Exception e){}
    }
  }
 }