How to trigger a event from simplet gui ?

Question

I have a very easy mainGUI whi extends JFrame          
JPanel pnl = new JPanel();
Container guiFlate = getContentPane();
guiFlate.setLayout(new BorderLayout());
guiFlate.add(pnl, BorderLayout.CENTER);
setSize(300, 300);
setVisible(true);
setBackground(Color.blue);If the user clicks left arrow, rigth arrow or space on the keyboard, I want something to happen. I dont quite get where to put the keyListener. Ive tried adding it to the JLabel and the class itself, put I never get a outprint
guiFlate.addKeyListener(new KeyListener() {
               public void keyPressed(KeyEvent p) {
                    System.out.println("KeyPressed");
               public void keyReleased(KeyEvent r) {
                    System.out.println("KeyReleased");
               public void keyTyped(KeyEvent t) {
                    System.out.println("KeyTyped");
          });

Answer 1

For a KeyListener to do anything, the component for which it is associated needs to have the input focus. So my guess is that your guiFlate thingy doesn't have the input focus when you're pressing the keys.