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About the test:

The Java SQL Test evaluates candidates on their ability to work with relational databases using Java programming language. The test assesses candidates on basic to advanced concepts of SQL queries, database design, and Java programming. Key skills and topics that are evaluated include understanding of relational databases, SQL queries, Java Database Connectivity (JDBC), data modeling, and data manipulation using Java. The test also includes a coding question to test hands-on programming skills.

Covered skills:

  • Java Basics
  • Exceptions
  • Database Design
  • Java Coding
  • Object-Oriented Programming
  • SQL Basics
  • Querying and Manipulating Data

9 reasons why
9 reasons why

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



Reason #1

Tests for on-the-job skills

The Java & SQL 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:

  • Demonstrates proficiency in Java Basics
  • Applies Object-Oriented Programming concepts effectively
  • Handles exceptions and errors efficiently
  • Displays a strong understanding of SQL Basics
  • Demonstrates knowledge of Database Design principles
  • Able to query and manipulate data in SQL databases
  • Competent in Java coding
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 & SQL 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

Medium

Multi Select
JOIN
GROUP BY
Solve
Consider the following SQL table:
 image
How many rows does the following SQL query return?
 image

Medium

nth highest sales
Nested queries
User Defined Functions
Solve
Consider the following SQL table:
 image
Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
 image

Medium

Select & IN
Nested queries
Solve
Consider the following SQL table:
 image
Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
 image

Medium

Sorting Ubers
Nested queries
Join
Comparison operators
Solve
Consider the following SQL table:
 image
What will be the first two tuples resulting from the following SQL command?
 image

Hard

With, AVG & SUM
MAX() MIN()
Aggregate functions
Solve
Consider the following SQL table:
 image
How many tuples does the following query return?
 image

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

Medium

Multi Select
JOIN
GROUP BY

2 mins

SQL
Solve

Medium

nth highest sales
Nested queries
User Defined Functions

3 mins

SQL
Solve

Medium

Select & IN
Nested queries

3 mins

SQL
Solve

Medium

Sorting Ubers
Nested queries
Join
Comparison operators

3 mins

SQL
Solve

Hard

With, AVG & SUM
MAX() MIN()
Aggregate functions

2 mins

SQL
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
Multi Select
JOIN
GROUP BY
SQL
Medium2 mins
Solve
nth highest sales
Nested queries
User Defined Functions
SQL
Medium3 mins
Solve
Select & IN
Nested queries
SQL
Medium3 mins
Solve
Sorting Ubers
Nested queries
Join
Comparison operators
SQL
Medium3 mins
Solve
With, AVG & SUM
MAX() MIN()
Aggregate functions
SQL
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 & SQL 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 & SQL 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 & SQL Assessment Test

Why you should use Pre-employment Java & SQL Online Test?

The Java & SQL 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:

  • Understanding of Java Basics
  • Proficient in Object-Oriented Programming concepts
  • Ability to handle Exceptions effectively
  • Strong knowledge of SQL Basics
  • Expertise in Database Design
  • Proficiency in Querying and Manipulating Data
  • Skilled in Java Coding
  • Experience in Design Patterns
  • Proficient in Multithreading and Concurrency
  • Knowledge of Servlets and JSP

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 & SQL Online Test?

  • Java Basics

    Java Basics covers the fundamental concepts and syntax of the Java programming language. This includes topics such as variables, data types, control structures, and basic input/output operations. It is important to measure this skill in the test as a strong foundation in Java Basics is necessary for effectively programming in Java.

  • Object-Oriented Programming

    Object-Oriented Programming (OOP) is a programming paradigm that allows for the organization and management of code through the use of objects, classes, and inheritance. This skill evaluates an individual's ability to apply OOP principles, including encapsulation, polymorphism, and abstraction, in Java. Measuring this skill is crucial as OOP is widely used in Java development and promotes modular and reusable code.

  • Exceptions

    Exceptions refer to the handling of unforeseen events that can disrupt the normal flow of program execution. This skill involves understanding various types of exceptions, such as checked and unchecked exceptions, and using try-catch blocks to handle them appropriately. Measuring this skill ensures the candidate can effectively handle error scenarios and write robust and reliable Java code.

  • SQL Basics

    SQL Basics cover the foundational concepts and syntax of the Structured Query Language (SQL). This includes topics such as creating and manipulating databases, defining tables, and querying data. Measuring this skill is essential as SQL is a standard language for interacting with relational databases, and a strong understanding of SQL Basics is crucial for working with data storage and retrieval.

  • Database Design

    Database Design involves creating the structure and organization of a database system. This skill encompasses designing database schemas, establishing relationships between tables, and optimizing database performance. Measuring this skill is important as a well-designed database enhances data integrity, reduces redundancy, and improves overall system efficiency.

  • Querying and Manipulating Data

    Querying and Manipulating Data focuses on retrieving and modifying data stored within databases using SQL. This skill evaluates the candidate's ability to write complex SQL queries, perform operations such as inserts, updates, and deletes, and understand database optimization techniques. Measuring this skill is crucial as it assesses the candidate's competency in working with real-world data and their ability to efficiently manipulate and manage it.

  • Java Coding

    Java Coding tests the candidate's ability to write correct and efficient Java code to solve specific problems or implement desired functionality. This skill covers various aspects, including code structure, algorithmic thinking, and adherence to best practices. Measuring this skill is essential to assess the candidate's hands-on programming abilities and their proficiency in implementing solutions using Java programming language.

  • 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 & SQL Test to be based on.

    Java variables
    Java data types
    Java control flow
    Java operators
    Java arrays
    Java classes
    Java inheritance
    Java polymorphism
    Java encapsulation
    Java exception handling
    SQL data types
    SQL table creation
    SQL queries
    SQL joins
    SQL aggregations
    SQL constraints
    SQL subqueries
    SQL indexing
    SQL views
    SQL transactions
    Database normalization
    Relational database design
    Database schemas
    ACID properties
    Query optimization
    Entity-Relationship (ER) diagrams
    Data modeling
    Primary keys
    Foreign keys
    Database indexing
    Database views
    Database triggers
    Java file I/O
    Java exception types
    Exception handling best practices
    Java try-catch-finally
    Checked vs unchecked exceptions
    Java custom exceptions
    SQL INSERT statements
    SQL UPDATE statements
    SQL DELETE statements
    SQL SELECT statements
    SQL filtering
    SQL sorting
    SQL aggregating
    SQL grouping
    Java object-oriented design
    Java inheritance vs composition
    Java abstraction
    SQL normalization
    SQL denormalization
    SQL indexing strategies
    Java coding conventions
    Java debugging
    Java code optimization
    SQL data manipulation
    SQL data definition
    SQL data control

What roles can I use the Java & SQL Online Test for?

  • Java Developer
  • Software Engineer Java
  • Backend Java Developer
  • SQL Developer
  • Java Full Stack Developer
  • Java Application Developer
  • SQL Database Developer

How is the Java & SQL 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

  • Demonstrated expertise in Performance Tuning
  • Ability to optimize SQL Queries
  • Experience in Advanced Database Concepts
  • Skilled in Application Testing and Debugging
  • Knowledge of Hibernate framework
  • Strong understanding of Spring framework
  • Proficient in RESTful web services
  • Experience with Microservices architecture
  • Ability to develop scalable and robust applications
  • Expertise in Agile software development practices
  • Strong knowledge of Design Principles and Patterns

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 & SQL Hiring Test FAQs

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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