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54 interview questions on Java - Fundamentalsfor developers (2025)

Test your technical skills before an interview of Java - Fundamentals with 54 corrected questions. Beginner, Intermediate or Expert level.

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54 questions
Easy
32 votes2954 runs
12 comments

Write a Java program that prints 'welovedev'.

Full stack developer
strings
variables
Pierreat Sep 19, 2022
Medium
14 votes1571 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
Easy
13 votes2862 runs
2 comments

How should a package be named in Java?

Full stack developer
packages
java
Pierreat Sep 19, 2022
Easy
11 votes2741 runs
2 comments

How to concatenate two strings of characters in Java?

Full stack developer
strings
concatenation
Pierreat Jan 4, 2022
Easy
8 votes2775 runs0 comment

Add elements to an ArrayList in Java

Full stack developer
arrays
lists
java
Pierreat Jan 4, 2022
Easy
7 votes2788 runs0 comment

Are arrays primitives types in Java?

Full stack developer
arrays
primitives
Pierreat Sep 19, 2022
Easy
6 votes1171 runs2 comments

Compare two strings in Java

Full stack developer
EL Mostafa Fadiliat Apr 8, 2024
Easy
5 votes2655 runs
3 comments

Write a valid code comment in Java

Full stack developer
comments
java
Pierreat Jan 4, 2022
Easy
5 votes2614 runs0 comment

What does `--` do in Java?

Full stack developer
operators
Pierreat Jan 4, 2022
Easy
5 votes2540 runs
3 comments

How to print an array in Java

Full stack developer
arrays
java
Pierreat Feb 6, 2024
Easy
5 votes1654 runs
1 comment

Given the following code, what will be displayed in the console?

Full stack developer
operators
modulo
Abderrazzak ATIFIat Nov 3, 2023
Medium
5 votes576 runs
3 comments

What is the benefit of using a ReentrantLock in Java?

Full stack developer
synchronisation
verrouillage
Anonymous authorat Dec 26, 2024
Easy
4 votes2703 runs
3 comments

What is “AssertEquals” used for in a Java Unit test?

Full stack developer
java
unit test
Pierreat Jan 4, 2022
Medium
4 votes2128 runs
8 comments

What are the modifiers that cannot be used with enums in Java?

Full stack developer
enums
Xiaoyuat May 12, 2023
Easy
4 votes1429 runs
1 comment

Print the result of the division of 5 by 2 in Java

Full stack developer
EL Mostafa Fadiliat Jan 25, 2024
Easy
4 votes1270 runs0 comment

What Java keyword is used to define a constant variable?

Full stack developer
EL Mostafa Fadiliat Mar 27, 2024
Medium
4 votes374 runs0 comment

Count the number of words in a string in Java

Full stack developer
hashmap
string
Pierreat Jan 4, 2022
Hard
4 votes283 runs3 comments

Test the autoboxing feature in Java.

Full stack developer
java
autoboxing
Joffreyat Jul 27, 2023
Medium
3 votes2886 runs5 comments

List the annotations that can be used in a JUnit test class.

Full stack developer
junit
annotations
Pierreat Jan 4, 2022
Easy
3 votes2522 runs
2 comments

How to call an interface in a java class?

Full stack developer
interfaces
java
Pierreat Jan 4, 2022