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Observer Design Pattern In Java

Observer design pattern in Java to notify all the objects to update themselves when an object state gets changed.

Output

Inside ConcreteObserverA::Update()
State = 1
Inside ConcreteObserverB::Update()
State = 1


Suresh Kumar Srivastava is founder of online learning site coursegalaxy.com and author of popular books C In Depth, Data Structures Through C In Depth. He has 18+ years experience in industry and worked on architecture and design of multiple products. This article Observer Design Pattern In Java is from his Design Patterns course.