KeyEvent and MouseEvent are subclasses of abstract InputEvent class .............
The KeyEvent class
A KeyEvent is gnerated when the keyboard input occurs.This low-level event is generated by a component object (such as a text field) when a key is pressed, released, or typed. The event is passed to every KeyListener or KeyAdapter object which registered to receive such events using the component's addKeyListener method.
Integer constants:
CHAR_UNDEFINED:
KEY_PRESSED and KEY_RELEASED events which do not map to a valid Unicode character use this for the keyChar value.
KEY_FIRST:
The first number in the range of ids used for key events.
KEY_LAST:
The last number in the range of ids used for key events.
KEY_PRESSED:
The "key pressed" event.
