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<b>Observer</b>: Defines an updating interface for objects that should be notified
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<b>ConcreteSubject</b>: Stores states of ConcreteObservers objects. Sends a notification Notifies other objects when a change has occurredbeen made.
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<b>ConcreteObserver</b>: Maintains Holds a reference to the ConcreteSubjects object. Synchronizes itself with the ConcreteSubject's state.
== Code Examples ==
