import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
public class HiirPall3 extends Applet 
                implements MouseListener, Runnable{
   double x, y, allserv=200, r=10;
   double samm=0, sammumuutus=0.5;
   boolean algus=true;
   Object luba=new Object();

   public HiirPall3(){
      addMouseListener(this);
   }
   public void mousePressed(MouseEvent e){
     //Plokki pääseb ainult siis, kui luba siinse lõime käes
     //Muul juhul oodatakse loa vabanemist
     synchronized(luba){ 
       x=e.getX(); y=e.getY(); 
     }
     samm=0;
     if(algus){
        new Thread(this).start();
        algus=false;
     }
   }
   public void run(){
     Graphics g=getGraphics();
     while(true){
       synchronized(luba){
         g.setColor(getForeground());
         g.drawOval((int)(x-r), (int)(y-r), (int)(2*r), (int)(2*r));
         try{Thread.sleep(100);}catch(Exception ex){}
         g.setColor(getBackground());
         g.drawOval((int)(x-r), (int)(y-r), (int)(2*r), (int)(2*r));
       }
       y=y+samm;
       samm=samm+sammumuutus;
       if(y>allserv){
         samm=-0.8*Math.abs(samm);
       }
     }     
   }
   public void mouseReleased(MouseEvent e){}
   public void mouseClicked(MouseEvent e){}
   public void mouseEntered(MouseEvent e){}
   public void mouseExited(MouseEvent e){}
   public static void main(String[] arg){
      Frame f=new Frame("Kukkuv pall");
      f.add(new HiirPall3());
      f.setSize(300, 300);
      f.setVisible(true);
   }
}