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Basic KeyListener help

Submitted by cubearth on Sat, 02/14/2009 - 21:52.
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Am now try to get fimilar with Key Listener, but my code is compiling, but key events are not being detected, it is a very simple program, cause am just trying to learn how the use key event, before i put it to practical use...this is my code

import java.awt.*;
import java.awt.event.*;
import javax.swing.JPanel;
import laszlo.*;

/**
*
* @author Greg
*/
public class Key extends JPanel implements KeyListener{

   

    public Key(){
        setBackground(Color.black);
        makeContent();
        addKeyListener(this);
        System.out.println("hello world");
    }

    public static void main(String[] args){
        JPanel panel = new Key();
        ApplicationFrame frame = new ApplicationFrame("Keys");
        frame.getContentPane().add(panel);
        frame.show();
    }

    protected RectangleGeometry rectangle;

    public void makeContent() {
    rectangle = new RectangleGeometry(0,0,10,15);
    System.out.println(rectangle.toString());

  }
    public void keyTyped ( KeyEvent e ){ 
        System.out.print(e.getKeyChar() + "is typed");
        rectangle.translate(10, 0);
        System.out.println("hello 2");
        repaint();
     } 
    public void keyPressed ( KeyEvent e){ 
        System.out.print(e.getKeyChar() + "is pressed");
        System.out.println("hello 3");
    } 
    public void keyReleased ( KeyEvent e ){ 
        System.out.print(e.getKeyChar() + "is released");
        System.out.println("hello 4");
    }

    @Override
    protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D)g;
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    g2.setPaint(Color.green);
    g2.fill(rectangle.shape());
    }

}

}