1  import java.awt.event.ActionEvent;

  2  import java.awt.event.ActionListener;

  3  import javax.swing.JFrame;

  4  import javax.swing.Timer;

  5  

  6  /** 	 	 	 	 	 	

  7     This frame contains a moving rectangle.

  8  */

  9  public class RectangleFrame extends JFrame

 10  {

 11     private static final int FRAME_WIDTH = 300;

 12     private static final int FRAME_HEIGHT = 400;

 13  

 14     private RectangleComponent scene;

 15  

 16     class TimerListener implements ActionListener

 17     {

 18        public void actionPerformed(ActionEvent event)

 19        {

 20           scene.moveRectangleBy(1, 1);

 21        }

 22     }

 23  

 24     public RectangleFrame()

 25     {

 26        scene = new RectangleComponent();

 27        add(scene);

 28  

 29        setSize(FRAME_WIDTH, FRAME_HEIGHT);

 30        

 31        ActionListener listener = new TimerListener();

 32  

 33        final int DELAY = 100; // Milliseconds between timer ticks

 34        Timer t = new Timer(DELAY, listener);

 35        t.start();      

 36     }

 37  }