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Java Design Patterns Interview Questions and Answers

Ques. Can you name few design patterns used in standard JDK library?
Ans. Decorator design pattern which is used in various Java IO classes, Singleton pattern which is used in Runtime , Calendar and various other classes, Factory pattern which is used along with various Immutable classes likes Boolean e.g. Boolean.valueOf and Observer pattern which is used in Swing and many event listener frameworks.
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