1.

What are some of the design patterns used in Java’s JDK library?

Answer»

FOLLOWING are some DESIGN patterns used in Java’s JDK library:

  • Decorator pattern are used by the Wrapper classes.
  • Singleton pattern is used in classes like CALENDAR and Runtime.
  • Factory pattern is used for methods like Integer.valueOf methods in wrapper classes.
  • Observer pattern is used for handling event frameworks like AWT, swing etc.


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