Java Online Test

Q: What are the main Java tests?

We offer several Java-related tests: Java & SQL Test Java & Spring Test Java, Spring & Hibernate Test Java, Spring & SQL Test Java & Android Test

The Java test uses scenario-based and code-tracing questions to evaluate candidates' knowledge of core Java concepts such as OOPs, Classes, Exceptions, Collections and advanced topics such as concurrent programming with threads and handling relational databases. The test uses simple Java Coding questions to assess a candidate's ability to code in Java.

Covered skills:

Foundations of the Java syntax and semantics
Basics of Web application programming
Object-Oriented Programming
Working with Databases
Java data structures (Strings; Arrays; Objects)
Collections framework
Exception handling
Multi-threading
Functional programming with Lambdas & Streams API
Core interface and implementations (List; Set; Map)
SOLID principles

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About the Java Test

The Java Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

Understanding the foundations of Java syntax and semantics
Creating web applications using Java
Applying object-oriented programming principles in Java
Working with databases in Java
Manipulating Java data structures (Strings, Arrays, Objects)
Utilizing the Java Collections framework
Efficiently handling exceptions and errors in Java
Implementing multi-threading in Java
Applying functional programming concepts with Lambdas & Streams API in Java
Understanding core interfaces and implementations in Java (List, Set, Map)
Utilizing SOLID principles in Java development

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Use Adaface tests trusted by recruitment teams globally. Adaface skill assessments measure on-the-job skills of candidates, providing employers with an accurate tool for screening potential hires.

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Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this Java Online Test will be non-googleable.

🧐 Question
Easy Custom Exception Exception Handling Custom Exceptions	Solve
What does the following code output?
Hard Holding References	Solve
What does the following Java code output?
Medium Abstract Interface OOPs Interfaces Java Syntax Object-oriented Programming (Oop) Concepts	Solve
Given following interface: Which of these are correct classes?
Medium Garbage Collection Garbage Collection Garbage_collection_rules Object_reachability	Solve
After which line is "bs" object, created on Line 4, eligible for garbage collection?
Hard Static Init Blocks OOPs Java Syntax Code Execution Output	Solve
What does the following code output? 1) G A B E D H 2) G B A D E H 3) G B A D E H C F 4) C F G A B E D H 5) C F G B A D E H 6) G C F A B E D H 7) G C F B A D E H
Easy Registration Queue Logic Queues Sorting By Custom Order	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
Medium Visitors Count Strings Logic String Parsing Character Counting	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill
	Easy Custom Exception Exception Handling Custom Exceptions	2 mins Java	Solve
What does the following code output?
	Hard Holding References	2 mins Java	Solve
What does the following Java code output?
	Medium Abstract Interface OOPs Interfaces Java Syntax Object-oriented Programming (Oop) Concepts	2 mins Java	Solve
Given following interface: Which of these are correct classes?
	Medium Garbage Collection Garbage Collection Garbage_collection_rules Object_reachability	2 mins Java	Solve
After which line is "bs" object, created on Line 4, eligible for garbage collection?
	Hard Static Init Blocks OOPs Java Syntax Code Execution Output	2 mins Java	Solve
What does the following code output? 1) G A B E D H 2) G B A D E H 3) G B A D E H C F 4) C F G A B E D H 5) C F G B A D E H 6) G C F A B E D H 7) G C F B A D E H
	Easy Registration Queue Logic Queues Sorting By Custom Order	30 mins Coding	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Medium Visitors Count Strings Logic String Parsing Character Counting	30 mins Coding	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Custom Exception Exception Handling Custom Exceptions	Java	Easy	2 mins	Solve
What does the following code output?
	Holding References	Java	Hard	2 mins	Solve
What does the following Java code output?
	Abstract Interface OOPs Interfaces Java Syntax Object-oriented Programming (Oop) Concepts	Java	Medium	2 mins	Solve
Given following interface: Which of these are correct classes?
	Garbage Collection Garbage Collection Garbage_collection_rules Object_reachability	Java	Medium	2 mins	Solve
After which line is "bs" object, created on Line 4, eligible for garbage collection?
	Static Init Blocks OOPs Java Syntax Code Execution Output	Java	Hard	2 mins	Solve
What does the following code output? 1) G A B E D H 2) G B A D E H 3) G B A D E H C F 4) C F G A B E D H 5) C F G B A D E H 6) G C F A B E D H 7) G C F B A D E H
	Registration Queue Logic Queues Sorting By Custom Order	Coding	Easy	30 mins	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Visitors Count Strings Logic String Parsing Character Counting	Coding	Medium	30 mins	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

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Why you should use Pre-employment Java Online Test?

The Java Online Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

Foundations of the Java syntax and semantics
Basics of Web application programming
Object-Oriented Programming
Working with Databases
Java data structures - Strings, Arrays, Objects
Collections framework
Exception handling
Multi-threading

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the Java Online Test?

Foundations of the Java syntax and semantics: This skill covers the fundamental building blocks of the Java programming language, including variables, data types, operators, control structures, and syntax rules. It is essential to measure this skill to ensure candidates have a solid understanding of the language's core concepts and can write clean and reliable code.

Basics of Web application programming: This skill focuses on the basics of developing web applications using Java, including HTTP request handling, servlets, JSP, and MVC architecture. Assessing this skill is crucial as it determines a candidate's ability to build scalable and efficient web applications in Java.

Object-Oriented Programming: Object-Oriented Programming (OOP) is a key paradigm in Java, emphasizing the use of objects, classes, inheritance, and polymorphism. Evaluating this skill is vital to assess a candidate's ability to design and develop modular and extensible code using OOP principles.

Working with Databases: This skill involves understanding how to interact with databases using Java, including connecting to a database, executing SQL queries, and handling result sets. It is crucial to measure this skill to ensure candidates can effectively store, retrieve, and manipulate data in a database-driven application.

Java data structures (Strings; Arrays; Objects): This skill covers the different data structures in Java, including strings, arrays, and objects. Assessing this skill is important as it determines a candidate's proficiency in working with and manipulating data efficiently.

Collections framework: The collections framework in Java provides interfaces and classes for defining and manipulating collections of objects. Measuring this skill is essential to evaluate a candidate's knowledge of using collections effectively, such as lists, sets, and maps, in solving various programming problems.

Exception handling: Exception handling is a critical aspect of Java programming that involves managing and responding to errors and exceptional conditions. Evaluating this skill helps determine a candidate's ability to handle exceptions properly and write robust and reliable code.

Multi-threading: This skill focuses on concurrent programming in Java, including creating and managing multiple threads to achieve parallel execution. Assessing this skill is important as it determines a candidate's understanding of thread synchronization, resource sharing, and handling race conditions.

Functional programming with Lambdas & Streams API: This skill involves utilizing functional programming concepts in Java, such as lambda expressions and the Streams API, for performing operations on collections of data. Measuring this skill is crucial to assess a candidate's ability to leverage the power of functional programming to write concise and expressive code.

Core interface and implementations (List; Set; Map): This skill covers the core interfaces and their implementations in Java, including List, Set, and Map. Assessing this skill is vital to evaluate a candidate's understanding of using these fundamental data structures efficiently and effectively.

SOLID principles: SOLID principles are design principles that help in writing maintainable and scalable code. Evaluating this skill determines a candidate's knowledge of these principles, such as Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion, and their application in designing robust and flexible software systems.

Full list of covered topics

The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for Java Online Test to be based on.

Variables

Data types

Operators

Control statements

Methods

Classes

Inheritance

Polymorphism

Abstraction

Encapsulation

Servlets

JSP

JavaServer Faces (JSF)

Java Persistence API (JPA)

Hibernate

SQL

CRUD operations

Database connectivity

String manipulation

Arrays

Wrapper classes

ArrayList

LinkedList

HashMap

HashSet

Exception handling

Thread synchronization

Concurrency

Lambda expressions

Streams

List interface

Set interface

Map interface

Single responsibility principle

Open/closed principle

Liskov substitution principle

Interface segregation principle

Dependency inversion principle

Java I/O

Serialization

Unit testing

Logging

Generics

Annotations

Internationalization (i18n)

Design patterns

Garbage collection

Networking

Reflection

JavaFX

Security

What roles can I use the Java Online Test for?

Java Developer
Backend Java Developer
Senior Java Engineer
Full Stack Developer
Java Software Architect
Technical Lead

How is the Java Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Functional programming with Lambdas & Streams API
Core interface and implementations - List, Set, Map
SOLID principles
Design patterns in Java
Database optimization and query optimization
Concurrency and synchronization

The coding question for experienced candidates will be of a higher difficulty level to evaluate more hands-on experience.

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Non-googleable Questions

Web Proctoring

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Webcam Proctoring

MCQ Questions

Coding Questions

Typing Questions

Personality Questions

Custom Questions

Ready-to-use Tests

Custom Tests

Custom Branding

Bulk Invites

Public Links

ATS Integrations

Multiple Question Sets

Custom API integrations

Role-based Access

Priority Support

GDPR Compliance

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Have questions about the Java Hiring Test?

What is the Java Online Test?

The Java Online Test assesses candidates on their knowledge of Java. It is designed for recruiters and hiring managers to evaluate a candidate's skills in areas like Java syntax, OOP, web application programming, and more.

Can I combine Java Online Test with Python questions?

Yes, you can request a custom test with multiple skills. For Python assessment details, check our Python Online Test.

What topics are evaluated in the Java Online Test?

This test covers Foundations of Java syntax and semantics, Basics of web application programming, OOP, Working with Databases, Java data structures, Collections framework, Exception handling, Multi-threading, Functional programming with Lambdas & Streams API, Core interfaces and implementations, and SOLID principles.

How to use the Java Online Test in my hiring process?

Use this test as a pre-screening tool at the recruitment process's start. You can add a link to the assessment in your job post or invite candidates via email.

Can I test Java and SQL together in a test?

Yes, you can. This is recommended to assess full-stack capabilities. Check out our Java & SQL Test.

What are the main Java tests?

We offer several Java-related tests:

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. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

Non-googleable questions
IP proctoring
Screen proctoring
Web proctoring
Webcam proctoring
Plagiarism detection
Secure browser
Copy paste protection

Read more about 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. A skills assessment is optimized 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 55%, 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?

Yes, you can sign up for free and preview this test.

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.

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Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

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