63 interview questions for developers (2025)

14 votes1557 runs0 comment

Eric Hostaleryat Dec 3, 2021

9 votes698 runs0 comment

Samuelat Mar 28, 2022

9 votes677 runs0 comment

Samuelat Mar 28, 2022

9 votes574 runs0 comment

design pattern

8 votes1438 runs0 comment

Eric Hostaleryat Dec 3, 2021

5 votes1426 runs

Eric Hostaleryat Dec 3, 2021

5 votes687 runs0 comment

Samuelat Mar 28, 2022

4 votes1510 runs0 comment

design pattern

Eric Hostaleryat Sep 19, 2022

4 votes1475 runs0 comment

Eric Hostaleryat Dec 3, 2021

4 votes1423 runs0 comment

Eric Hostaleryat Dec 3, 2021

4 votes1384 runs1 comment

4 votes657 runs1 comment

operator overloading

Samuelat Mar 28, 2022

3 votes1455 runs0 comment

Eric Hostaleryat Dec 3, 2021

3 votes1447 runs0 comment

Eric Hostaleryat Mar 13, 2023

3 votes1422 runs1 comment

Eric Hostaleryat Dec 3, 2021

3 votes564 runs0 comment

Samuelat Mar 28, 2022

3 votes271 runs0 comment

polymorphism

encapsulation

Monemat Nov 3, 2023

2 votes598 runs0 comment

design pattern

Samuelat Mar 28, 2022

2 votes559 runs1 comment

access modifiers

Samuelat Mar 28, 2022

2 votes554 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