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

public class Exam extends Applet implements MouseListener{
  int x=100;
  int y=100;
  int alaServ=900;
  public Exam(){
    addMouseListener(this);
  }
  public void mousePressed(MouseEvent e){
    x=e.getX();
    y=e.getY();
    int samm=1;     
    double sammuMuutus=1;
    Graphics g=getGraphics();
    while (y<alaServ){
	  g.setColor(Color.green);
      g.drawRect(x, y, 25, 25);
      try{Thread.sleep(100);} catch(Exception viga){}
	  g.setColor(getBackground());
      g.drawRect(x, y, 25, 25); 
      y=y+samm;
      samm+=sammuMuutus;
    }
	

  }
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[] argumendid){
  Frame f=new Frame();
  f.add(new Exam());
  f.setSize(300, 300);
  f.setVisible(true);
}
}