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336 interview questionsfor Cybersecurity Engineer (2026)

Test your technical skills before an interview of Cybersecurity Engineer with 336 corrected questions. Beginner, Intermediate or Expert level.

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336 questions
Easy
42 votes2187 runs1 comment

Write a Python function that returns the factorial of a number.

Back-end developer
recursion
Vincent Cotroat Mar 28, 2023
Easy
36 votes3208 runs
12 comments

Write a Java program that prints 'welovedev'.

Full stack developer
strings
variables
Pierreat Sep 19, 2022
Hard
26 votes2559 runs
1 comment

Write a Python function that prints the elements of a list.

Back-end developer
list
for loop
Anonymous authorat Mar 28, 2022
Hard
17 votes3588 runs
1 comment

How many times is the condition `(a++ < 15)` evaluated in the following code? ```java int a = 3; while (a++ < 15) { if ((a++ % 5) == 0) break; } ```

Back-end developer
loops
control flow
Thomas De verdièreat Dec 16, 2021
Easy
15 votes3104 runs
2 comments

How should a package be named in Java?

Full stack developer
packages
java
Pierreat Sep 19, 2022
Medium
15 votes1848 runs
1 comment

What is the difference between an interface and an abstract class in Java?

Full stack developer
EL Mostafa Fadiliat Feb 13, 2024
Hard
14 votes3603 runs1 comment

Serialization can be customized with the Externalizable interface

Back-end developer
serialization
interface
Thomas De verdièreat Jan 4, 2022
Easy
14 votes3482 runs0 comment

What does the final keyword mean in front of a method in Java?

Back-end developer
java
methods
Thomas De verdièreat Jan 4, 2022
Hard
14 votes3424 runs0 comment

How many instance of Integer cannot be freed from memory?

Back-end developer
array
memory
Thomas De verdièreat Dec 16, 2021
Hard
12 votes3627 runs0 comment

A Customer class has the com.company.model package.

Back-end developer
inheritance
package
Thomas De verdièreat Jan 4, 2022
Hard
12 votes3585 runs
1 comment

What is the error message when you try to serialize a class that does not implement Serializable?

Back-end developer
java
serialization
Thomas De verdièreat Dec 2, 2021
Hard
12 votes3534 runs0 comment

A monitor in Java

Back-end developer
java
thread
Thomas De verdièreat Jan 4, 2022
Medium
12 votes2324 runs0 comment

Use the zip() function to iterate over two lists in parallel.

Back-end developer
list
zip
Anonymous authorat Mar 28, 2022
Hard
11 votes3476 runs0 comment

What "design pattern" makes it possible to offer a means of treating the elements of a tree without worrying about the course?

Back-end developer
design pattern
tree
Thomas De verdièreat Jan 4, 2022
Easy
11 votes2957 runs
2 comments

How to concatenate two strings of characters in Java?

Full stack developer
strings
concatenation
Pierreat Jan 4, 2022
Easy
11 votes2291 runs0 comment

What type is `function_a` in the following code ?

Back-end developer
functions
decorators
Anonymous authorat Mar 28, 2022
Hard
10 votes3573 runs0 comment

A “synchronized” method

Back-end developer
java
method
Thomas De verdièreat Jan 4, 2022
Easy
10 votes3007 runs0 comment

Add elements to an ArrayList in Java

Full stack developer
arrays
lists
java
Pierreat Jan 4, 2022
Medium
10 votes2603 runs0 comment

Start a HTTP server from the CLI with python

Back-end developer
cli
http
Anonymous authorat Jan 23, 2023
Easy
9 votes3401 runs0 comment

Which of these classes is the most suitable for composing a character string from several elements concatenated to each other?

Back-end developer
string
java
Thomas De verdièreat Jan 4, 2022
Cybersecurity Engineer tests