Top 20 most asked Java OOP’s Questions in Interviews.

Reference : Java OOP’s

What is Object-Oriented Programming (OOP)?
What are the four main principles of OOP?
Explain the concept of a class in Java.
What is an object in Java?
What is encapsulation in Java?
How do you achieve encapsulation in Java?
Wh…


This content originally appeared on DEV Community and was authored by Piyush Kumar Singh

Reference : Java OOP's

  1. What is Object-Oriented Programming (OOP)?

  2. What are the four main principles of OOP?

  3. Explain the concept of a class in Java.

  4. What is an object in Java?

  5. What is encapsulation in Java?

  6. How do you achieve encapsulation in Java?

  7. What is the purpose of getter and setter methods?Explain the
    concept of access modifiers.

  8. What is inheritance in Java?

  9. How does inheritance promote code reusability?

  10. What is the difference between single inheritance and multiple inheritance?

  11. Why does Java not support multiple inheritance?

  12. What is the super keyword in Java?

  13. What is polymorphism in Java?

  14. Explain the difference between compile-time polymorphism and runtime polymorphism.

  15. What is method overloading and method overriding?

  16. How is method overloading an example of compile-time polymorphism?

  17. How is method overriding an example of runtime polymorphism?

  18. What is the significance of the instanceof keyword in Java?

  19. What is abstraction in Java?

  20. What is the hashCode() method used for?

Other References :

Java8 : Link
Advance Java : Link
Core Java : Link
Java OOP's : Link
Spring Boot : Link
Advanced Spring Boot : Link
Linux : Link
ReactJS : Link
API : Link
OS : Link
NodeJS : Link
Python : Link
HTML : Link

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This content originally appeared on DEV Community and was authored by Piyush Kumar Singh


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