Java How to Program (early objects), 9/e

14.17 Key Event Handling

This section presents the KeyListener interface for handling key events. Key events are generated when keys on the keyboard are pressed and released. A class that implements KeyListener must provide declarations for methods keyPressed, keyReleased and key-Typed, each of which receives a KeyEvent as its argument. Class KeyEvent is a subclass of InputEvent. Method keyPressed is called in response to pressing any key. Method key-Typed is called in response to pressing any key that is not an action key. (The action keys are any arrow key, Home, End, Page Up, Page Down, any function key, etc.) Method key-Released is called when the key is released after any keyPressed or keyTyped event.

The application of Figs. 14.36–