Source and listener
What do you mean by the term source and listener?
Expert
The source is an object which produces an event. This takes place when the internal state of that object changes in a certain manner. A listener is an object which is notified whenever an event takes place. It consists of two major requirements. First, it should have been registered with a source to receive the notifications regarding specific event. Second, it should implement essential methods to receive and process such notifications.
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