What are the Examples of Observer Design Pattern in JDK ?

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In JDK there are many places where Observer design pattern is used. Some of these are..

1 - java.util.Observer, java.util.Observable

2 - javax.servlet.http.HttpSessionAttributeListener

3 - javax.servlet.http.HttpSessionBindingListener

4 - All implementations of java.util.EventListener, and also in Swing packages

5 - javax.faces.event.PhaseListener

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