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What is source and listener?
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Answer / janet
Source: A source is an object that generates an event.this
occurs when the internal state of that object changes in
some way.
Listener: A listener is an object that is notified when an
event occurs.It has two major requirements First,it must
have been registered with one or more sources to receive
notifications about specific types of events.Second,it must
implement methods to receive and process these
notifications.
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