Java Online Test

20 questions total, 50 minutes maximum, for mid and senior-level programmers

With this Java test, you can assess the skills of prospective candidates before ever inviting them to an interview.

The exam consists of 20 questions compiled by a group of experts in the Java programming language and covers a broad spectrum of Java knowledge. You can use our Java online test to easily identify which candidates show the highest aptitude for Java development and which you can safely pass on.

Taking advantage of Java quiz is a surefire way to streamline your interview process!

Test Single Applicant Test Multiple Applicants

Coding test includes:

Java - 20 Questions

Object-Oriented Programming (OOP)
Data Structures and Algorithms
References
Generics
Miscellaneous: Java Basics, Garbage Collection, Threading, Exceptions

Sample Java Test Question

Which of the following Java classes effectively prevent other classes from modifying their internal data? (Check all that apply.)

Note that for the purposes of this question, neither reflection nor bytecode manipulation may be used to modify another class.

Answers

The correct answers are 4 and 5.

Explanation

Immutability is tricky in Java. To achieve it, you must:

Not expose any mutators (setters)
Protect your Java class from being subclassed
Make sure all mutable data you expose is either immutable or a defensive copy

Java Interview Questions

So you've got candidates who have passed our online test – great!

Now it's time to invite them to a live interview so you can personally ask some programming questions.

Our team of experts has assembled a set of ready-made Java interview questions and answers you can use in your interview process. We provide all the information you need to interview candidates like a professional developer!

Be sure to check out our blog article, 10 Java Programming Questions to Ask on Interview!

Sample Java Test Report

This sample Java test report shows what employers/recruiters receive via email after a candidate completes one of our coding tests. It includes an overall score and a detailed breakdown by specific knowledge areas, providing a clear view of a candidate's coding skills.

Reports are provided in PDF format, making them easy to read, share and print.

Java Coding Test Report

Download Sample Report

Custom Branding

Do you want the Java coding test to match your own branding?

No problem! Use your company's domain and logo without any mention of Tests4Geeks.

Your applicants will think these programming assessment tests are all yours!

Branding

"They totally blow away the competition as far as a better product value."
Maurice H. on Capterra.com

F.A.Q.

Does every candidate have to answer the same questions?

Yes. The Java test consists of the same questions for every candidate.

In order to properly compare candidates, they need to answer questions of the same difficulty level, and different questions always mean different difficulty levels.

However, the order of questions and answers is randomized for each applicant.

How should I interpret the exam scores?

First of all, you need to keep in mind one very important thing:

The purpose of this Java online test is not to help you find the best developers.

Its purpose is to help you avoid the worst ones.

For example, you have 5 candidates who get scores of 35, 45, 60, 65, and 80, based on a maximum possible score of 100.

We would recommend you invite the last three (those scoring 60, 65, and 80) to a live interview, not just the one who scored an 80/100.

What is the format of the test?

We chose a multiple-choice, or quiz, format for two reasons.

It removes performance anxiety. Many developers freeze when asked to write code under time pressure while being watched. Picking an answer from a list lets them focus on the problem instead of the stress, giving you a more accurate read on their actual knowledge.
It tests the right skill for the AI era. Today, most code is written with AI assistance. The skill that matters now is judgment: reading unfamiliar code, spotting bugs, and choosing the right approach. Multiple-choice questions built around real code snippets test exactly this.

What skill level is the test for?

The test is primarily created for mid and senior-level developers.

Resumes are easy to inflate, and "senior" means very different things at different companies. This Java skills test is a fast, objective way to find out who can actually deliver what they claim on paper.