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

9 reasons why
9 reasons why

Adaface Java Test is the most accurate way to shortlist Java Developers



Reason #1

Tests for on-the-job skills

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
Reason #2

No trick questions

no trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

View sample questions

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface
Reason #3

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 10,000+ 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?
 image

Hard

Holding References
Solve
What does the following Java code output?
 image

Medium

Abstract Interface
OOPs
Interfaces
Solve
Given following interface:
 image
Which of these are correct classes?
 image

Medium

Garbage Collection
Garbage Collection
Solve
After which line is "bs" object, created on Line 4, eligible for garbage collection?
 image

Hard

Static Init Blocks
OOPs
Solve
What does the following code output?
 image
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
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
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

Hard

Holding References

2 mins

Java
Solve

Medium

Abstract Interface
OOPs
Interfaces

2 mins

Java
Solve

Medium

Garbage Collection
Garbage Collection

2 mins

Java
Solve

Hard

Static Init Blocks
OOPs

2 mins

Java
Solve

Easy

Registration Queue
Logic
Queues

30 mins

Coding
Solve

Medium

Visitors Count
Strings
Logic

30 mins

Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Custom Exception
Exception Handling
Custom Exceptions
Java
Easy2 mins
Solve
Holding References
Java
Hard2 mins
Solve
Abstract Interface
OOPs
Interfaces
Java
Medium2 mins
Solve
Garbage Collection
Garbage Collection
Java
Medium2 mins
Solve
Static Init Blocks
OOPs
Java
Hard2 mins
Solve
Registration Queue
Logic
Queues
Coding
Easy30 minsSolve
Visitors Count
Strings
Logic
Coding
Medium30 minsSolve
Reason #4

1200+ customers in 75 countries

customers in 75 countries
Brandon

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

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment Java Online Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Science behind Adaface tests
Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the Java Online Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

invite candidates
Reason #7

Detailed scorecards & benchmarks

View sample scorecard
Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

test completion rate
Reason #9

Advanced Proctoring


Learn more

About the Java Assessment Test

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.

Singapore government logo

The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.


85%
reduction in screening time

Java Hiring Test FAQs

What type of questions will the Java Online Test include?

The test will have MCQ questions and coding questions. The coding question is designed to evaluate hands-on Java programming experience. The MCQ questions are scenario-based to evaluate on-the-job skills as opposed to just theoretical concepts.

How can I test multiple Java related skills in a single pre-employment test?

Our customized assessments allow you to test multiple skills in a single test. For example, suppose you are looking for a Java developer with knowledge of Spring and SQL. In that case, we customize an assessment to assess all the three skills in the test.

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

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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