Tuesday, March 10, 2009

How are Observer and Observable used? (CoreJava)

Question :How are Observer and Observable used? (CoreJava)
Answer :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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