OOP quiz

Test your OOP knowledge with a free interactive quiz — 50 questions with answers and explanations. No signup needed to play.

Which best describes "inheritance"?

1. Which best describes "inheritance"?
2. What is method overriding?
3. You have `interface Printable { void print(); }` and `class Receipt implements Printable`. What must `Receipt` do?
4. What are the four classical pillars of OOP?
5. What is an abstract class?
6. What does `instanceof` (or its equivalent) tell you?
7. What is object-oriented programming (OOP)?
8. What is the purpose of getters and setters?
9. What is `super` used for in a subclass?
10. What is the difference between a class and an object?
11. Which statement about constructors is most accurate?
12. What does `this` (or `self` in Python) refer to inside an instance method?

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