Freshers (0–2 years)

OOP Interview Questions for Freshers

Preparing for your first OOP interviews? This set is curated for freshers and early-career developers (0–2 years): the 28 questions that come up most for entry-level roles, each with a clear answer, example code and follow-ups.

28Questions14Beginner14Intermediate

28 OOP questions

  1. 1What is polymorphic behavior in real systems?Intermediate
  2. 2What are design patterns in OOP?Intermediate
  3. 3What is aggregation vs composition in OOP?Intermediate
  4. 4What is Dependency Injection in OOP?Intermediate
  5. 5What is the Dependency Inversion Principle (DIP)?Intermediate
  6. 6What is the Interface Segregation Principle (ISP)?Intermediate
  7. 7What is the Open/Closed Principle (OCP)?Intermediate
  8. 8What is the Liskov Substitution Principle (LSP)?Intermediate
  9. 9What is the Single Responsibility Principle?Intermediate
  10. 10What are SOLID principles?Intermediate
  11. 11What is composition vs inheritance?Intermediate
  12. 12What are access modifiers in OOP?Beginner
  13. 13What is an interface in OOP?Beginner
  14. 14What is method overriding?Beginner
  15. 15What is method overloading?Beginner
  16. 16What is a constructor in OOP?Beginner
  17. 17What is abstraction in OOP?Beginner
  18. 18What is polymorphism in OOP?Beginner
  19. 19What is inheritance in OOP?Beginner
  20. 20What is encapsulation in OOP?Beginner
  21. 21What is a class and an object in OOP?Beginner
  22. 22OOP Interview Question 5 (Free)Intermediate
  23. 23OOP Interview Question 4 (Free)Beginner
  24. 24OOP Interview Question 2 (Free)Intermediate
  25. 25OOP Interview Question 1 (Free)Beginner
  26. 26OOP Advanced Interview Question 8Intermediate
  27. 27OOP Advanced Interview Question 7Beginner
  28. 28OOP Advanced Interview Question 10Beginner

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Frequently asked questions

Which OOP questions do freshers (0–2 years) get asked?

This page collects 28 OOP interview questions aligned with freshers (0–2 years), ranging across the difficulty levels that match that experience band.

How do I prepare for a OOP interview with my experience level?

Work through these questions in order, make sure you can explain each answer out loud, and pay attention to the real-world examples and follow-ups — interviewers at this level care as much about reasoning as the final answer.

Do the answers include code and examples?

Yes — answers include explanations, code examples where relevant, common mistakes to avoid and follow-up questions so you are ready for the full interview conversation.