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Home>IT Tests>Questions>Object-oriented programming - Fundamentals

44 interview questions on Object-oriented programming - Fundamentalsfor developers (2026)

Test your technical skills before an interview of Object-oriented programming - Fundamentals with 44 corrected questions. Beginner, Intermediate or Expert level.

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44 questions
Hard
13 votes838 runs0 comment

Overrided method visibility must be the same or less restrictive than the inherited method.

IT Architect
OOP
visibility
inheritance
Samuelat Mar 28, 2022
Easy
10 votes856 runs0 comment

Inheritance in OOP.

IT Architect
OOP
inheritance
methods
Samuelat Mar 28, 2022
Easy
7 votes836 runs0 comment

Can a class implements several interfaces ?

IT Architect
OOP
interfaces
inheritance
Samuelat Mar 28, 2022
Medium
5 votes805 runs1 comment

When can you do a+b in OOP ?

IT Architect
OOP
operator overloading
classes
Samuelat Mar 28, 2022
Medium
4 votes643 runs0 comment

Explain the difference between overriding and overloading in OOP.

IT Architect
OOP
methods
inheritance
Samuelat Mar 28, 2022
Medium
3 votes753 runs2 comments

Which modification of the following code WILL NOT make the output be "success" ?

IT Architect
OOP
inheritance
overriding
Samuelat Mar 28, 2022
Medium
3 votes688 runs
3 comments

What does the following code return ?

IT Architect
OOP
inheritance
access modifiers
Samuelat Mar 28, 2022
Medium
3 votes668 runs0 comment

Overloading an operator in OOP

IT Architect
OOP
operators
classes
Samuelat Mar 28, 2022
Medium
3 votes410 runs0 comment

A child class B of an abstract class A must define the abstract methods of A.

IT Architect
OOP
abstract
class
Samuelat Mar 28, 2022
Medium
2 votes785 runs
3 comments

In this code, the class B extends the class A. The class B overrides the method talk() from the class A. The object b is an instance of the class B. The object a is an instance of the class A. The object a is assigned to the object b. The object a calls the method talk(). The method talk() from the class B is called.

IT Architect
OOP
inheritance
polymorphism
Samuelat Mar 28, 2023
Medium
2 votes734 runs0 comment

How to instantiate objects with a type which is derivated from an abstract type in OOP

IT Architect
OOP
design pattern
abstract
Samuelat Mar 28, 2022
Easy
2 votes680 runs0 comment

Encapsulation rule in Object-Oriented Programming

IT Architect
OOP
encapsulation
classes
Samuelat Mar 28, 2022
Easy
2 votes653 runs0 comment

What does this program print ?

IT Architect
OOP
inheritance
overriding
Samuelat Mar 28, 2022
Medium
2 votes215 runs0 comment

Which Design Pattern should I use to give dynamically new responsabilities to an object ?

IT Architect
OOP
design pattern
decorator
Samuelat Mar 28, 2022
Easy
1 vote675 runs0 comment

How to apply the principle of encapsulation in OOP?

IT Architect
OOP
encapsulation
visibility
Samuelat Mar 28, 2022
Easy
1 vote674 runs0 comment

Which Design Pattern should I use if I want an object to be notified when another kind of object state changed?

IT Architect
OOP
design pattern
observer
Samuelat Mar 28, 2022
Easy
1 vote213 runs0 comment

How to keep common data for the whole class in OOP?

IT Architect
OOP
class
static
Samuelat Mar 28, 2022
Medium
1 vote212 runs0 comment

How to add two vectors in a class Vector2D in OOP

IT Architect
OOP
operator overloading
classes
Samuelat Mar 28, 2022
Easy
1 vote201 runs0 comment

What is encapsulation in Object-Oriented Programming?

IT Architect
OOP
classes
objects
EL Mostafa Fadiliat Nov 8, 2024
Medium
1 vote198 runs0 comment

What are the symbols of visibility for *public*, *protected* and *private* in UML?

IT Architect
OOP
uml
visibility
Samuelat Mar 28, 2022