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- What is an observer pattern in Java?
- What is the observer pattern used for?
- What is an observer pattern give an example?
What is an observer pattern in Java?
Observer is a behavioral design pattern that allows some objects to notify other objects about changes in their state. The Observer pattern provides a way to subscribe and unsubscribe to and from these events for any object that implements a subscriber interface.
What is the observer pattern used for?
Observer design pattern is useful when you are interested in the state of an object and want to get notified whenever there is any change. In observer pattern, the object that watch on the state of another object are called Observer and the object that is being watched is called Subject.
What is an observer pattern give an example?
What Is the Observer Pattern? Observer is a behavioral design pattern. It specifies communication between objects: observable and observers. An observable is an object which notifies observers about the changes in its state. For example, a news agency can notify channels when it receives news.
