import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.util.LinkedList;

public class Pall3 extends Applet implements MouseListener, Runnable{

	LinkedList Pallid=new LinkedList();	
	
	public Pall3(){
			addMouseListener(this);
			new Thread(this).start();
	}
	
	public void run(){
				while(3>2){
					//try{Thread.sleep(50);}catch(Exception exs){}
					if (Pallid.size()<1){Pallid.add(new Pall());}
					repaint();
				}
	}
	
	 	public void mouseReleased(MouseEvent e){}
  	public void mouseClicked(MouseEvent e){}
  	public void mouseEntered(MouseEvent e){}
  	public void mouseExited(MouseEvent e){}
  	
  	public void mousePressed(MouseEvent e){
  		if(Pallid.size()>0){
  			Pall pl=(Pall)Pallid.get(0);
  			int hx=e.getX();
				int hy=e.getY();
				int px=pl.X();
				int py=pl.Y();
				if (hx-10<px+10 && hx+10>px-10 && hy-10<py+10 && hy+10>py-10){
					Pallid.remove(0);	
				}
			}	
  	}
  	
  	public void update(Graphics g){paint(g);}
  	public void paint(Graphics g){
  			if(Pallid.size()>0){
  				Pall pl=(Pall)Pallid.get(0);
  				if(pl.Y()>getSize().height){
  					Pallid.remove(0);
  				}else{
  					int x=pl.X();
  					int y=pl.Y();
  					g.setColor(Color.red);
  					g.fillOval(x, y, 20, 20);
  					try{Thread.sleep(20);}catch(Exception ex){}
  					g.setColor(Color.white);
  					g.fillOval(x,y,20,20);
  				}
  			}
  	}

		public static void main(String arg[]){
			Frame f=new Frame();
     	f.add(new Pall3());
     	f.setSize(300, 300);
     	f.setVisible(true);
     		
		}

	class Pall{
			int px,py;
			long algaeg=System.currentTimeMillis(); //initsialiseeritakse palli algusaeg
			public Pall(){
				px=(int)(Math.random()*(getSize().height-20));
				py=(int)(Math.random()*150);
			}
			
			int X() //ütleb objekti x koordinaadi
			{
				return px;
			}
			int Y() //ütleb objekti y koordinaadi
			{
				double dt=(System.currentTimeMillis()-algaeg)/1000.0; //palli vanus
				py=(int)(py+(0.98*dt*dt)/4); //y koordinaadi arvutamine
				return py;
			}
		}	
}