1.

Name some of the design patterns which are used in JDK library.

Answer»

Following are some of the design patterns which are used in JDK library.

  • Decorator patttern is used by Wrapper classes.

  • Singleton pattern is used by Runtime, Calendar classes.

  • Factory pattern is used by Wrapper class like Integer.valueOf.

  • Observer pattern is used by event handling frameworks like swing, awt.


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