Problem about event handling or dispatching

Question

I created a JFrame with a JButton in it. A keyListener is add to the jframe.
Key events can be catched if JDK1.3.1_08 is employed. However, it doesn't work if JDK1.4.1_02 is empolyed. Can anyone tell me the problem? Thanks a lot!
The following is the source code:
public class drawa extends JFrame implements KeyListener
public static void main(String[] args) {  
     drawa frame = new drawa();
public drawa() {   
     super("drawa");
     Container c=getContentPane();
     c.setLayout(null);
     JButton jb=new JButton("L");
     jb.setSize(80,40);
     c.add(jb);     
     addKeyListener(this);
     setSize(500,450);          
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     setVisible(true);          
public void keyPressed(KeyEvent evt){
     System.out.println("a");
public void keyTyped(KeyEvent evt){}
public void keyReleased(KeyEvent evt){}

Answer 1

Your frame must return true for isFocusable ().
Kind regards,
  Levi