OOP quiz

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

What is object-oriented programming (OOP)?

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

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