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48 interview questions on Java - Fundamentalsfor developers (2024)

Test your technical skills before an interview of Java - Fundamentals with 48 corrected questions. Beginner, Intermediate or Expert level.

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48 questions
Easy
24 votes2388 runs
7 comments

Write a Java program that prints 'welovedev'.

Full stack developer
strings
variables
Pierreat Sep 19, 2022
Medium
10 votes979 runs0 comment

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

Full stack developer
EL Mostafa Fadiliat Feb 13, 2024
Easy
9 votes2314 runs
1 comment

How should a package be named in Java?

Full stack developer
packages
java
Pierreat Sep 19, 2022
Easy
9 votes2245 runs1 comment

How to concatenate two strings of characters in Java?

Full stack developer
strings
concatenation
Pierreat Jan 4, 2022
Easy
7 votes2232 runs0 comment

Add elements to an ArrayList in Java

Full stack developer
arrays
lists
java
Pierreat Jan 4, 2022
Easy
6 votes2273 runs0 comment

Are arrays primitives types in Java?

Full stack developer
arrays
primitives
Pierreat Sep 19, 2022
Medium
5 votes1527 runs
5 comments

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

Full stack developer
enums
Xiaoyuat May 12, 2023
Medium
4 votes2219 runs1 comment

How to print an array in Java

Full stack developer
arrays
java
Pierreat Feb 6, 2024
Easy
4 votes2201 runs
2 comments

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

Full stack developer
java
unit test
Pierreat Jan 4, 2022
Easy
4 votes2171 runs2 comments

Write a valid code comment in Java

Full stack developer
comments
java
Pierreat Jan 4, 2022
Easy
4 votes2152 runs0 comment

What does `--` do in Java?

Full stack developer
operators
Pierreat Jan 4, 2022
Hard
3 votes2316 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 votes2122 runs1 comment

How to call an interface in a java class?

Full stack developer
interfaces
java
Pierreat Jan 4, 2022
Medium
3 votes1371 runs2 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
Easy
3 votes1139 runs0 comment

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

Full stack developer
operators
modulo
Abderrazzak ATIFIat Nov 3, 2023
Easy
3 votes897 runs0 comment

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

Full stack developer
EL Mostafa Fadiliat Jan 25, 2024
Easy
3 votes666 runs1 comment

Compare two strings in Java

Full stack developer
EL Mostafa Fadiliat Apr 8, 2024
Medium
3 votes275 runs0 comment

Count the number of words in a string in Java

Full stack developer
hashmap
string
Pierreat Jan 4, 2022
Hard
3 votes202 runs3 comments

Test the autoboxing feature in Java.

Full stack developer
java
autoboxing
Joffreyat Jul 27, 2023
Medium
3 votes154 runs2 comments

What tools are essential to develop a java application?

Full stack developer
java
compiler
Auroreat Feb 15, 2024