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

Question

Q:

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

Answer 1

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.