Observer Design Pattern by Example. This design pattern is useful when we want get notified about changes in the object state Today, I will discuss simple and very useful behavioral design pattern called — Observer Design Pattern. Observer design pattern in Java is very important pattern and as name suggest it’s used to observe things. The Observer pattern facilitates good object-oriented design and promotes loose coupling. Hey, I have just reduced the price for all products. The objects that observe on the state of another object is called Observer and the object that is being watched is called Subject. To explain the Observer pattern lets use an example. Whenever a new edition is published by the publisher,it will be circulated among subscribers whom have subscribed to publisher. This is just on instance of implementing the simple observer class. The Observer pattern is such a popular design pattern that the jdk has provided a set of classes that make it easy to implement it. 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This design pattern is useful when we want get notified about changes in the object state Today, I will discuss simple and very useful behavioral design pattern called — Observer Design Pattern. Observer design pattern in Java is very important pattern and as name suggest it’s used to observe things. The Observer pattern facilitates good object-oriented design and promotes loose coupling. Hey, I have just reduced the price for all products. The objects that observe on the state of another object is called Observer and the object that is being watched is called Subject. To explain the Observer pattern lets use an example. Whenever a new edition is published by the publisher,it will be circulated among subscribers whom have subscribed to publisher. This is just on instance of implementing the simple observer class. The Observer pattern is such a popular design pattern that the jdk has provided a set of classes that make it easy to implement it. 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