63 interview questions for developers (2025)

14 votes1546 runs0 comment

Eric Hostaleryat Dec 3, 2021

9 votes668 runs0 comment

Samuelat Mar 28, 2022

9 votes646 runs0 comment

Samuelat Mar 28, 2022

9 votes563 runs0 comment

design pattern

8 votes1428 runs0 comment

Eric Hostaleryat Dec 3, 2021

5 votes1415 runs

Eric Hostaleryat Dec 3, 2021

5 votes657 runs0 comment

Samuelat Mar 28, 2022

4 votes1498 runs0 comment

design pattern

Eric Hostaleryat Sep 19, 2022

4 votes1464 runs0 comment

Eric Hostaleryat Dec 3, 2021

4 votes1412 runs0 comment

Eric Hostaleryat Dec 3, 2021

4 votes1374 runs1 comment

4 votes626 runs1 comment

operator overloading

Samuelat Mar 28, 2022

3 votes1444 runs0 comment

Eric Hostaleryat Dec 3, 2021

3 votes1436 runs0 comment

Eric Hostaleryat Mar 13, 2023

3 votes1410 runs1 comment

Eric Hostaleryat Dec 3, 2021

3 votes549 runs0 comment

Samuelat Mar 28, 2022

3 votes260 runs0 comment

polymorphism

encapsulation

Monemat Nov 3, 2023

2 votes570 runs0 comment

design pattern

Samuelat Mar 28, 2022

2 votes535 runs1 comment

access modifiers

Samuelat Mar 28, 2022

2 votes531 runs0 comment

encapsulation

Samuelat Mar 28, 2022

63 interview questionsfor developers (2025)

Test your developer skills before an interview with 63 corrected questions on 80+ topics. Beginner, Intermediate or Expert level.

63 interview questionsfor developers (2025)

Test your developer skills before an interview with 63 corrected questions on 80+ topics. Beginner, Intermediate or Expert level.

Is the following code valid? class Person { constructor(name, age) { this.name = name; this.age = age; } } const person = new Person('John', 20); console.log(person.name); console.log(person.age);

Inheritance in OOP.

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

You need to develop a class for which there should be only one instance throughout your application. Which design pattern should you use for this?

Can we extend an abstract class in Java?

Is the following code valid? class Person { constructor(name, age) { this.name = name; this.age = age; } } const person = new Person('John', 20); console.log(person.name); console.log(person.age);

Can a class implements several interfaces ?

Which design pattern allows to dynamically add responsibilities to an object?

Is the following code valid? class Person { constructor(name, age) { this.name = name; this.age = age; } } const person = new Person('John', 20); console.log(person.name); console.log(person.age);

Is the following code valid? class Person { constructor(name, age) { this.name = name; this.age = age; } } const person = new Person('John', 20); console.log(person.name); console.log(person.age);

Can an interface inherit from another interface?

When can you do a+b in OOP ?

Is the following code valid? class Person { constructor(name, age) { this.name = name; this.age = age; } } const person = new Person('John', 20); console.log(person.name); console.log(person.age);

Implement the interface IEmailFormatter for the classes Person, Company, and ListOfPerson, which has a method GetEmailContent()

Implement the registration method on class A in a virtual way,Override the registration method on classes A1 and A2 when implementing these classes

Explain the difference between overriding and overloading in OOP.

Inheritance, polymorphism and encapsulation

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

What does the following code return ?

Encapsulation rule in Object-Oriented Programming