Java Online Test

20 questions total, 50 minutes maximum, for mid-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!

Programming 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.


Answer 1
Answer 2
Answer 3
Answer 4
Answer 5

The correct answers are 4 and 5.


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!


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1. Does every candidate have to answer the same questions?

Yes. 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.

2. 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.

3. Coding Test vs. Quiz

The test is presented in a multiple-choice, or quiz, format, rather than requiring test takers to write code.

If we used a coding test instead, we would have to check all answers manually, which would obviously be impossible.

4. What skill level is the test for?

The test is primarily created for mid-level developers.

5. What about junior and senior level developers?

The test can also be used to test junior programmers, but you should reduce your acceptance score drastically to compensate.

Likewise, you can use it to test senior Java developers as well, with an increased acceptance score.

Some will argue that it's pointless to judge senior developers based on a test meant for mid-level developers. This is generally true if you're looking for specific skills in a candidate rather than a broad base of expertise.

But at the same time, anyone can claim to be a senior developer on their resume. If you're concerned that candidates might be overstating their knowledge and accomplishments, this Java skills test is a good way to determine which ones can actually deliver what they promise.

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