Event Listeners are objects that are responsible for handling a particular task of a component. They are
notifi ed when an event is occurred. The Listener typically implements the interface that contains event-
handling code for a particular component. An EventListener interface will typically have a separate
method for each distinct event type the event class represents.
The methods that receive and process events are defi ned in a set of interfaces found in java.awt.
event(). For example, the FocusListener interface defi nes two methods, focusGained()and
focusLost(), one for each event type ...
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