Home > DeveloperSection > Interviews > How are Observer and Observable used?

Posted on    July-15-2011 12:44 AM

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James Smith

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Posted on    July-15-2011 12:00 AM

Objects that subclass the Observable class maintain a list of observers. When an Observable object is updated it invokes the update() method of each of its observers to notify the observers that it has changed state. The Observer interface is implemented by objects that observe Observable objects.

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