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19 interview questions on Object Oriented Programmingfor developers (2025)

Test your technical skills before an interview of Object Oriented Programming with 19 corrected questions. Beginner, Intermediate or Expert level.

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19 questions
Medium
8 votes1448 runs0 comment

Can we extend an abstract class in Java?

IT Architect
OOP
abstract
class
Eric Hostaleryat Dec 3, 2021
Hard
4 votes1520 runs0 comment
Medium
4 votes1394 runs1 comment
Easy
3 votes281 runs0 comment

Inheritance, polymorphism and encapsulation

IT Architect
OOP
inheritance
polymorphism
encapsulation
Monemat Nov 3, 2023
Hard
2 votes1443 runs
1 comment

What are the public methods of the class `Person`?

IT Architect
OOP
methods
visibility
Eric Hostaleryat Dec 3, 2021
Hard
2 votes462 runs
1 comment
Hard
1 vote1467 runs1 comment

What is the default value of a field in a class in Java?

IT Architect
OOP
constructor
object
Eric Hostaleryat Dec 3, 2021
Easy
1 vote1319 runs0 comment
Expert
0 vote1425 runs2 comments