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Observer and Observable

 
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What are Observer and Observable?How they are used?
 
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Observer and Observable are a pair of interface and class
in the java.util package to implement a general purpose
Observer pattern. something similar to the event delegation model.
Observable is any Object on which Observers may be registered
and which notifies the registered Observers about the changes
taking place in the state of the Observable.
Observer is an interface which is used for implementing
the action to be taken when the update is taking place on the
Observable.
 
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