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Java Design Patterns Interview Questions and Answers

  Difficulty Level: AllBeginnerIntermediateExpert

Ques 1. What is design patterns?

Ques 2. Can you name few design patterns used in standard JDK library?

Ques 3. What is Singleton design pattern in Java ? write code for thread-safe singleton in Java.

Ques 4. What is main benefit of using factory pattern? Where do you use it?

Ques 5. What is observer design pattern in Java?

Ques 6. Give example of decorator design pattern in Java ? Does it operate on object level or class level?

Ques 7. What is decorator design pattern in Java?

Ques 8. What is Factory Design Pattern with example?

Ques 9. What is Abstract Factory Design Patter in Java with example?

Ques 10. What is Singleton Design Pattern with example in java design patterns?

Ques 11. What is Prototype Design Pattern in java design patterns?

Ques 12. What is Decorator Design Pattern in java design patterns?

Ques 13. What is Observer Design Pattern in java design patterns?

Ques 14. What is MVC design pattern in java design patterns?

Ques 15. What is builder pattern and give an example.

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