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samar
Java Observer and Observable
1 Answer(s)      3 years and 10 months ago
Posted in : Java Interview Questions


How are Observer and Observable used?

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October 26, 2010 at 6:28 PM


Hi,

Here is the answer.

Subclass of Observable class maintain a list of observers. Whenever an Observable object is updated, it invokes the update() method of each of its observers to notify the observers that it has a changed state.

An observer is any object that implements the interface Observer.

Thanks.



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