What roles can I use the Java Test for?

Here are few roles for which we recommend this test: Java Developer Backend Java Developer Senior Java Engineer Full Stack Developer Java Software Architect Technical Lead

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: Java & SQL Test Java & Spring Test Java, Spring & Hibernate Test Java, Spring & SQL Test Java & Android Test

Java Online 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.

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Screen candidates with a 40 mins test

Test duration: 40 mins

Difficulty level: Moderate

Availability: Ready to use

Questions:

8 Java MCQs
1 Java Coding Question

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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Adaface is used by 1200+ businesses in 80 countries.

Adaface skill assessments measure on-the-job skills of candidates, providing employers with an accurate tool for screening potential hires.

Use the Java Test to shortlist qualified candidates

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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Screen candidates with the highest quality 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.

Test candidates on core Java Hiring Test topics

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.

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