import java.awt.*;
import java.awt.event.*;

public class muster extends Panel implements MouseListener{
   public muster(){
     addMouseListener(this);
   }
   public void mousePressed(MouseEvent e){
     int x=e.getX();
     int y=e.getY();   //saab hiirevajutusega koordinaadid
     int dx=2;      //liikumiskiirused
     int dy=1;
     int parem=200, vasak=0, ulal=5, all=250;
   
     Graphics g=this.getGraphics();
   
      g.drawOval(x,y,10,10);
      g.setColor(Color.yellow);
      joonistaPall(g, x, y);
    while(true){
      if(x>parem)dx=-Math.abs(dx);        // hakkab while-tsüklis liikumine
      if(y>all)dy=-Math.abs(dy);
      if(x<vasak)dx=Math.abs(dx);
      if(y<ulal)dy=Math.abs(dy);
      x+=dx;    //saab liikumiskiirused
      y+=dy;
      try{
        Thread.sleep(30);
      }catch(Exception ex){}
      g.setColor(Color.green);
      joonistaPall(g, x, y);          
     }    
   }
   public void mouseReleased(MouseEvent e){}
   public void mouseEntered(MouseEvent e){}
   public void mouseExited(MouseEvent e){}
   public void mouseClicked(MouseEvent e){}
   void joonistaPall(Graphics g, int x, int y){
     g.fillOval(x, y, 10, 10);
   }                                              
   public static void main(String argumendid[]){
     Frame f=new Frame();
     f.add(new muster());
     f.setSize(250, 300);
     f.setVisible(true);
  }
}