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

40 interview questions on Object-oriented programming - Fundamentalsfor developers (2024)

Test your technical skills before an interview of Object-oriented programming - Fundamentals with 40 corrected questions. Beginner, Intermediate or Expert level.

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40 questions
Hard
8 votes542 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
7 votes562 runs0 comment

Inheritance in OOP.

IT Architect
OOP
inheritance
methods
Samuelat Mar 28, 2022
Easy
4 votes553 runs0 comment

Can a class implements several interfaces ?

IT Architect
OOP
interfaces
inheritance
Samuelat Mar 28, 2022
Medium
4 votes528 runs1 comment

When can you do a+b in OOP ?

IT Architect
OOP
operator overloading
classes
Samuelat Mar 28, 2022
Medium
2 votes479 runs0 comment

Explain the difference between overriding and overloading in OOP.

IT Architect
OOP
methods
inheritance
Samuelat Mar 28, 2022
Medium
1 vote512 runs2 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
Expert
1 vote474 runs1 comment

What does the following code return ? public class A { public void talk() { echo "I am A" } public secretTalk() { this.talk() } } public class B extends A { private void talk() { echo "I am B" } public secretTalk() { this.talk() } } A b = new B() b.talk() b.secretTalk() Answer : "I am A" "I am B"

IT Architect
OOP
inheritance
overriding
Samuelat Mar 28, 2022
Easy
1 vote444 runs0 comment

How to apply the principle of encapsulation in OOP?

IT Architect
OOP
encapsulation
visibility
Samuelat Mar 28, 2022
Medium
1 vote443 runs0 comment

Overloading an operator in OOP

IT Architect
OOP
operators
classes
Samuelat Mar 28, 2022
Medium
1 vote136 runs0 comment

How to add two vectors in a class Vector2D in OOP

IT Architect
OOP
operator overloading
classes
Samuelat Mar 28, 2022
Easy
0 vote479 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
Medium
0 vote452 runs1 comment

What does the following code return ?

IT Architect
OOP
inheritance
access modifiers
Samuelat Mar 28, 2022
Easy
0 vote450 runs0 comment

Encapsulation rule in Object-Oriented Programming

IT Architect
OOP
encapsulation
classes
Samuelat Mar 28, 2022
Hard
0 vote450 runs1 comment

Can the dynamic type of an object change after its instantiation?

IT Architect
OOP
object
type
Samuelat Mar 28, 2022
Easy
0 vote447 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
Medium
0 vote444 runs0 comment

What does this code return ? public class A { public void talk() { echo "Hello my name is A" } } public class B extends A { public void talk() { echo "Hello my name is B" } } B b = new B(); A a = b; B b2 = (B) a; b2.talk();

IT Architect
OOP
inheritance
polymorphism
Samuelat Mar 28, 2022
Medium
0 vote444 runs1 comment

How is inheritance represented in UML?

IT Architect
OOP
uml
inheritance
Samuelat Mar 28, 2022
Easy
0 vote439 runs0 comment

What does this program print ?

IT Architect
OOP
inheritance
overriding
Samuelat Mar 28, 2022
Medium
0 vote299 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
Hard
0 vote174 runs0 comment

Write a Java program that will print the name of the class that is being executed.

IT Architect
OOP
inheritance
downcasting
Samuelat Mar 28, 2022