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Java Online Assessment Test

🕒 Allotted Time: approx 45 mins

🧐 Questions:

  • 10 Java MCQs
  • 2 Java Coding Questions

⚙️ Customized Based On:

  • Experience/ difficulty level
  • Multiple skills in 1 assessment
  • Job description/ role requirements

🧪 Test Options:

  • Preset test: 0 setup time
  • Customized test: < 48 hour setup time

📝 Topics:

Data Types

Use it to execute and run java codes in runtime environments

Java Virtual Machine

Use to recycle memory no longer being used by java application

Garbage Collector

Provides the class libraries and resources used to run a java program

Java Runtime Environment
String handling

Development environment for building applications, applets, and components using the Java programming language

Java Development Kit

Use it to call specific methods during runtime

Just-in-Time (JIT) Compiler

Use to store multiple values in a single variable

See full list

Sample Adaface Java Online Questions

These are just a small sample from our library of 10,000+ questions. The actual questions on this test will be non-googleable.

🧐 Question🔧 Skill💪 Difficulty⌛ Time
Custom Exception - What does the following code o
JavaEasy2 min
Holding References - What does the following Java c
JavaMedium2 min
Abstract Interface - Given following interface:
OOPs Interfaces
JavaMedium2 min
Garbage Collection - After which line is "bs" objec
Garbage Collection
JavaMedium2 min
Static Init Blocks - What does the following code o
JavaMedium2 min

How to use the Adaface Java Online test

Start screening candidates within minutes with the Adaface Java Online ready-to-go test

1. Choose the most appropriate test for your role

2. Start inviting candidates to complete the assessment

3. Receive real time notifications and shortlist the best candidates

OR Customize the Adaface Java Online Test according to your job description

1. Get a custom assessment from our library of 700+ skills within 48 hours

2. Start inviting candidates to complete the assesment

3. Receive real time notifications and shortlist the best candidates

Adaface Java Online test is trusted by enterprises worldwide

Morgan Stanley
SG Government
Ernst and Young
Optimum Solutions
United Nations
Love Bonito

About the Adaface Java Online Test

Evaluate technical and coding skills with Adaface Java online skills testing platform powered by an intelligent chatbot


Data Types

Use it to execute and run java codes in runtime environments

Java Virtual Machine

Use to recycle memory no longer being used by java application

Garbage Collector

Provides the class libraries and resources used to run a java program

Java Runtime Environment
String handling

Development environment for building applications, applets, and components using the Java programming language

Java Development Kit

Use it to call specific methods during runtime

Just-in-Time (JIT) Compiler

Use to store multiple values in a single variable


Execution of the most common Java string programs like Anagrams, reverse strings, convert string to integer, palindrome, etc.


Execution of most common Java Matrix programs like, add two matrices, multiplication of matrices, transpose, inverse, etc.


Execution of most common java Search and Sort programs like, Merge sort, bubble sort, binary search, etc.

Searching and Sorting
Core Java
Exception handling
Concurrent collection

Change of one data type to another, like string to another data type and vice versa

Java Conversion Programs

Execution of the most common Java basic problems like Fibonacci series, prime numbers, factorials, palindrome, etc.

Java Basic Programs
Serialisation & De-serialisation
Collection framework

Recommended Roles:

Core Java Developer
Core Java Programmer
Backend Developer
Web Developer

About Java

Platform Independence

Programs can run on various different types of computers; as long as the system has a Java Runtime Environment (JRE) installed in it, a Java program can run on it.


Most types of computer systems are compatible with a JRE. Including PCs that run on Windows, computers that use Unix or Linux operating system, Apple computers using Macintosh OS, large mainframe computers, and mobile phones as well.

Long-term Presence

Since it has been around for ages, some of the biggest organizations in the world have been built using the Java language. Major banks, insurance companies, retailers, utilities, and manufacturers all use Java.


Java is an evolving language that almost uniquely combines stability with innovation.


Codes that you may have written 15 years ago will run on the most up-to-date JVMs and gain the speed advantage of native code translating, the latest profiling, and memory management.

Why You Should Use This Java Online Test

The Java Online test helps recruiters and hiring managers identify qualified candidates from a pool of resumes and take objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves expensive engineering time by filtering out unqualified candidates.

The Adaface Java test screens candidates for the typical skills recruiters look for in a Java developer:

  • Core Java knowledge
  • OOPs fundamentals
  • Understanding on interfacing, class overriding, polymorphism
  • Experience with Java Classes, Streams, Java 8 Lambda

The insights generated from this assessment can be used by recruiters and hiring managers to identify the best candidates for the role. Anti-cheating features enable you to be comfortable with conducting assessments online. The Java developer test is ideal for helping recruiters identify which candidates have the technical skills to do well on the job.

The Java Online assessment test is designed to test for Java fundamentals and hands-on coding skills.

The Adaface Java Online Assessment test screens candidates for these typical skills recruiters look for in a Java developer:

Java fundamentals: These questions are designed to evaluate a candidate's knowledge and expertise of technical concepts in Java-like OOPs, classes, interfaces, multithreading, design patterns, Java 8, exception handling, etc.

Java Coding skills: These questions are designed to assess a candidate's programming ability and debugging skills in Java. In addition, these also test for problem-solving skills.

About Java Developer Job Roles

Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX.

Java is class-based, object-oriented, and designed to have as few implementation dependencies as possible. It is intended to let application developers write once, run anywhere, meaning that compiled Java code can run on all platforms that support Java without the need for recompilation.

Java is one of the most portable languages available at a developer’s disposal. A great Java developer can build a highly distributed web application, a sophisticated desktop application, or even a powerful mobile application running on a handheld device. With the power of Java Virtual Machine behind the platform, sometimes a talented developer is all it takes to build a robust, secure, and efficient application. This Java Online Test for hiring candidates focuses on testing for on-the-job skills.

Typical Java Developer responsibilities include:

  • Designing and developing high-volume, low-latency applications for mission-critical systems and delivering high availability and performance
  • Analyzing user requirements to inform application design
  • Defining application objectives and functionality
  • Integrating applications by designing database architecture and server scripting; studying and establishing connectivity with network systems, search engines, and information servers
  • Supporting users by developing documentation and assistance tools

The Java test is designed to filter out candidates for job roles like:

  • Core Java Developer
  • Core Java Programmer
  • Backend Developer
  • Web Developer

Distribution Of Test Scores

The actual score distributon will vary based on your candidate pipeline quality, but you should typically expect ~20% of the candidates to do well on Adaface assessments.

The score distribution for our assessments follow the normal curve. This is a good sign- standardized tests like SAT and GRE follow the normal distribution (bell curve).

Status quo assessments typically have the exact opposite of the bell curve (too many candidates getting close to 0, too many candidates getting close to 100 and too few candidates in the middle). This is typically because they focus on theoretical questions or trick questions, which are very binary in nature- either you know the trick/ theory or you don’t.

How Adaface Is Different

Adaface conversational assessments are reflective of on-the-job skills and see an 86% completion rate as compared to ~50% for traditional assessment platforms.



Theoretical questions/ puzzles

Feels like a test

One-size-fits-all assessments




Questions for on-the-job skills





What is meant by OOPS in Java?

Object-Oriented Programming is a programming style that is associated with the concepts like class, object, Inheritance, Encapsulation, Abstraction, Polymorphism. Most popular programming languages like Java, C++, C#, Ruby, etc. follow an object-oriented programming paradigm. In OOP, computer programs are designed in such a way that everything is an object that interacts with other objects. The main aim of OOP is to bind together the data and the functions that operate on them so that no other part of the code can access this data except that function.

What type of questions will the Java Online Test include?

The test is designed to enable recruiters and hiring managers to quickly identify which candidates should be invited to an interview.

This test will assess candidates on their fundamentals and depth of Java programming languages with questions on:

  • OOPs basics
  • Strings
  • Classes
  • Interfaces
  • Multi-threading
  • Design patterns
  • Exception handling etc.

The questions are designed to test for on-the-job Java skills as opposed to just theoretical concepts. The programming and debugging challenges test the problem-solving and coding ability of your candidates.

What skills are required for a Java role?

Depending on the role and industry, a Java developer might require these skills:

  • Understanding of Object-Oriented Programming concepts
  • Understanding of when to use design patterns such as Singleton, Factory, Fly-weight, Builder, Object Pool, Iterator, Strategy, Visitor, Composite. This skill is particularly important for senior Java developers who will have to work on the architecture of applications to design long-term solutions
  • Understanding of the class loading process and how class loaders work
  • Deep understanding of the nuanced world of performance, whether that be memory overhead, computation complexity, or speed
  • Knowledge of when memory is being allocated, from what context, and how it affects heap fragmentation
  • Familiarity with the various garbage collection algorithms, and how to use the profilers
  • Experience with JSP / Servlets, Web Frameworks like Struts / Spring, and Service-Oriented Architecture / Web Services – SOAP / REST
  • Ability to apply the most modern patterns and language features to existing systems
  • Experience in using technologies in the Java ecosystem: Struts, Spring, Maven, Gradle, Ant, JUnit, Spock, and Hibernate, among many others
  • Knowledge of the intricacies of SQL queries
  • Ability to learn new technologies and willingness to step out of comfort zone to explore and learn new skills
What is a custom assessment?

Every role is different and requires a custom assessment to identify top candidates efficiently. Adaface subject matter experts understand your job description/ role requirements and pick the most relevant questions from our library of 10000+ questions to create a technical assessment that helps you find the qualified candidates in your candidate pipeline quickly. All custom assessments are set up based on the job description, role requirements, must-have skills, experience level and salary range within a maximum of 48 hours and you will get an email notification once it goes live.

Check out a sample assessment here (no credit card required).

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify.

How is Adaface different from other assessment tools?

We believe that status quo tech assessment platforms are not a fair way for companies to evaluate engineers because they focus on trick questions/ puzzles/ niche algorithms. We started Adaface to help companies find great engineers by assessing on-the-job skills required for a role. Read more about why we started Adaface.

Here's what's different with Adaface:

  • High quality non-googleable questions that test for on-the-job skills as opposed to theoretical knowledge.
  • A friendly conversational assessment with a chatbot, instead of sending a "test" to a candidate. This translates to a higher completion rate. Adaface assessments (86% candidate completion rate), as opposed to traditional tests (40-50% candidate completion rate)
  • Customized assessments for 700+ skills at different experience levels.
Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

  • Web proctoring
  • Webcam proctoring
  • Plagairism detection
  • Non-googleable questions
  • Secure browser

Read more the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. As in an assessment is optimizing to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 60%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

The platform is completely self-serve, so here's one way to proceed:

  • You can sign up for free to get a feel for how it works.
  • The free trial includes one sample assessment (Java/ JavaScript) that you will find in your dashboard when you sign up. You can use it to review the quality of questions, and the candidate experience of a conversational test on Adaface.
  • To review the quality of questions, you can also review our public questions for 50+ skills here.
  • Once you're convinced that you want to try it out with real assessments and candidates, you can pick a plan according to your requirements.
I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!

Brandon Lee, Head of People, Love, Bonito

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Have any questions about the Adaface Java Online Test?
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