//
// CORRECT: the animation is performed in a separate
// thread, which will be started by actionPerformed()
// of the mouse listener
//
// rule of thumb: listener methods should not perform
//  substantial computation, and should not sleep().
//  Start separate threads instead.
//

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


public class SleepExample extends Frame {

  private Rectangle position;
  private static SleepExample ex;

  private SleepExample () {

    setSize(400, 400);
    setTitle("Sleep Example");
    position = new Rectangle(150, 0, 100, 100);

    Button button = new Button("Fall");
    button.addActionListener(new ExampleActionListener());
    add("North", button);
  }


  private class ExampleActionListener implements ActionListener
  {
    public void actionPerformed (ActionEvent e)
      {
	(new FallingBallThread()).start();
      }
  }


  class FallingBallThread extends Thread {
	
    public void run() {
      try {
	position = new Rectangle(150, 0, 100, 100);
	while (position.y < 400) {
	  position.y = position.y + 10;
	  System.out.println("Position.y: " + position.y);
	  ex.test(); 
	  Thread.sleep(10);
	}
      }
      catch (Exception ex) {
	System.out.println("Exception: " + ex);
      }
    }
  }


  public void test ()
    {
      System.out.println("TEST!");
      repaint();
    }


  public void paint (Graphics g)
    {
      System.out.println("PAINT!");
      g.setColor(Color.blue);
      g.fillOval(position.x, position.y, position.width, position.height);
    }


  public static void main (String[] args)
    {
      ex = new SleepExample();
      ex.show();
    }
}