Chapter 2 - Event Listeners
Now that you know how to display things on screen you need a way to
respond to the user actions. This is done with the EventListeners. An
Event is a user interaction.
Reacting on GUI cmponents is done by adding ActionListeners, another
way to interact is with the mouse and that is is explained in the MouseListener
and MouseMotionListener examples.
Another Listener is the KeyboardListener, but since you can use the TextFields
it is not a common class you will use.
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