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   | java.util.Observer | 
Observer is the interface to be implemented by objects that receive notification of updates on an Observable object.
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|  | 
           This method is called if the specified 
            Observableobject'snotifyObserversmethod is called (because theObservableobject has been updated. | ||||||||||
This method is called if the specified Observable object's notifyObservers method is called (because the Observable object has been updated.
| observable | the Observableobject. | 
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| data | the data passed to notifyObservers(Object). |