Observer pattern is used when there is one-to-many relationship between objects such as if one object is modified, its depenedent objects are to be notified automatically. Observer pattern falls under behavioral pattern category.
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Observer and java. util. Observable exist, they have been deprecated in Java 9 because the model implemented was quite limited.
Read moreIs MVC an Observer pattern?
The Observer Pattern is the foundation of the Model View Controller (MVC) pattern , in which a view is updated automatically whenever the model’s state changes. In the . NET Framework, delegates with events are an implementation of the Observer pattern.
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