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Java™
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Observable
An Observable object is an object that is being observed by one or more observers. You subclass the Observable object to give it this functionality. Whenever something interesting happens in the Observable object, it calls notifyObservers which notifies all observers that have previously registered by calling the Observable's method addObserver.
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Design Patterns/J2EE Patterns
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General:
How do I change the state of the Observable object?
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