An abstract adapter class for receiving keyboard events.
The methods in this class are empty. This class exists as
convenience for creating listener objects.
Extend this class to create a KeyEvent listener
and override the methods for the events of interest. (If you implement the
KeyListener interface, you have to define all of
the methods in it. This abstract class defines null methods for them
all, so you can only have to define methods for events you care about.)
Create a listener object using the extended class and then register it with
a component using the component's addKeyListener
method. When a key is pressed, released, or typed,
the relevant method in the listener object is invoked,
and the KeyEvent is passed to it.
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An abstract adapter class for receiving keyboard events.
