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51 interview questions on Java - Fundamentalsfor developers (2025)

Test your technical skills before an interview of Java - Fundamentals with 51 corrected questions. Beginner, Intermediate or Expert level.

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51 questions
Easy
28 votes2805 runs
12 comments

Write a Java program that prints 'welovedev'.

Full stack developer
strings
variables
Pierreat Sep 19, 2022
Medium
13 votes1415 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
12 votes2717 runs
2 comments

How should a package be named in Java?

Full stack developer
packages
java
Pierreat Sep 19, 2022
Easy
11 votes2611 runs
2 comments

How to concatenate two strings of characters in Java?

Full stack developer
strings
concatenation
Pierreat Jan 4, 2022
Easy
8 votes2629 runs0 comment

Add elements to an ArrayList in Java

Full stack developer
arrays
lists
java
Pierreat Jan 4, 2022
Easy
7 votes2659 runs0 comment

Are arrays primitives types in Java?

Full stack developer
arrays
primitives
Pierreat Sep 19, 2022
Easy
6 votes1044 runs2 comments

Compare two strings in Java

Full stack developer
EL Mostafa Fadiliat Apr 8, 2024
Easy
5 votes2534 runs
3 comments

Write a valid code comment in Java

Full stack developer
comments
java
Pierreat Jan 4, 2022
Easy
5 votes2499 runs0 comment

What does `--` do in Java?

Full stack developer
operators
Pierreat Jan 4, 2022
Easy
5 votes2490 runs
3 comments

How to print an array in Java

Full stack developer
arrays
java
Pierreat Feb 6, 2024
Easy
4 votes2576 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 votes1972 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 votes1525 runs
1 comment

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

Full stack developer
operators
modulo
Abderrazzak ATIFIat Nov 3, 2023
Easy
4 votes1300 runs
1 comment

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

Full stack developer
EL Mostafa Fadiliat Jan 25, 2024
Medium
4 votes428 runs
3 comments

What is the benefit of using a ReentrantLock in Java?

Full stack developer
synchronisation
verrouillage
Anonymous authorat Dec 26, 2024
Medium
4 votes349 runs0 comment

Count the number of words in a string in Java

Full stack developer
hashmap
string
Pierreat Jan 4, 2022
Hard
4 votes261 runs3 comments

Test the autoboxing feature in Java.

Full stack developer
java
autoboxing
Joffreyat Jul 27, 2023
Hard
3 votes2741 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 votes2461 runs
2 comments

How to call an interface in a java class?

Full stack developer
interfaces
java
Pierreat Jan 4, 2022
Easy
3 votes1582 runs
3 comments

Which of the following statements applies to methods of an interface in Java? (from java 8)

Full stack developer
java
interface
Nathalieat Mar 28, 2023