KeyListener in Java is abstract; unable to instantiate?

Question

I try to create a Key Listener in java, but when I try

KeyListener listener = new KeyListener();

Netbeans tells me that KeyListener is abstract, cannot be created. I know that I don’t have any other part of this listener, but since this is my first time using a key listener, I’m not sure what else I need. Why does this tell me that?

Thank,

Tomek

Answer 1

KeyListener- this is an interface - it must be implemented by something. So you can do:

KeyListener listener = new SomeKeyListenerImplementation();

but you cannot create it directly. You can use an anonymous inner class:

KeyListener listener = new KeyListener()
{
    public void keyPressed(KeyEvent e) { /* ... */ }

    public void keyReleased(KeyEvent e) { /* ... */ }

    public void keyTyped(KeyEvent e) { /* ... */ }
};

It depends on what you want to do, basically.

Answer 2

KeyListener - , , , . , , inline, KeyAdapter, , KeyListener, . KeyAdapter, , , . , keyPressed,

KeyListener listener = new KeyAdapter()
{
    public void keyPressed(KeyEvent e) { /* ... */ }
};

.

Answer 3

KeyListener - , , . , tutorial.