Java SE (Java Platform, Standard Edition)

Hellow!

I am dealing with keyboard listener in MVC pattern.

I would like to make a controller with ActionListner and KeyListener.

public class ArtillaryTankController implements ActionListener, KeyListener {

    public void actionPerformed( ActionEvent e) {
        ....
    }

    public void keyPressed(KeyEvent e) {
	System.out.println("Key Pressed");

	if (e.getKeyCode() == KeyEvent.VK_KP_LEFT)
		System.out.println("Left_Arrow_Key Pressed");

	if (e.getKeyCode() == KeyEvent.VK_KP_RIGHT)
		System.out.println("Right_Arrow_Key Pressed");		
    }
	
    public void keyTyped(KeyEvent e) {
	System.out.println("Key Typed");	
    }
	
    public void keyReleased(KeyEvent e) {
        System.out.println("Key Released");
    } 

}

public class ArtillaryTankWorldPanel extends JPanel {
    ....
}

public class ArtillaryTankFrame extends JFrame {
    ....
    _artillaryTankWorldPanel =new ArtillaryTankWorldPanel(_frameWidth, _frameHeight);
      
    final ArtillaryTankController controller = new ArtillaryTankController(_artillaryTankWorldPanel);
    ....

    _artillaryTankWorldPanel.addKeyListener(controller);

    ....
}

The ActionListeners works fine, but the KeyListener does not work. I can't see any message.

Please, guide me to find the right way.

Thanks for reading.
Sincerely yours