A
listener is an object that is notified when an event occurs.
It
has two major requirements:
o First,
it must have been registered with one or more sources to receive notifications
about specific types of events.
o Second,
it must implements methods to receive and process these notifications.
The
methods that receive and process events are defined in a set of interfaces
found in java.awt.event. For
example, the MouseMotionListener
interface defines two methods to receive notifications when the mouse is
dragged or moved.
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