Java & SQL Online Test

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Other important programming tests include: Java Online Test Python Online Test JavaScript Online 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
Object-Oriented Programming
Exceptions
SQL Basics
Database Design
Querying and Manipulating Data
Java Coding

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About the Java & SQL Test

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

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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 & SQL 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
Medium Multi Select JOIN GROUP BY Sql Join Data Analysis	Solve
Consider the following SQL table: How many rows does the following SQL query return?
Medium nth highest sales Nested queries User Defined Functions	Solve
Consider the following SQL table: Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
Medium Select & IN Nested queries	Solve
Consider the following SQL table: Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
Medium Sorting Ubers Nested queries Join Comparison operators	Solve
Consider the following SQL table: What will be the first two tuples resulting from the following SQL command?
Hard With, AVG & SUM MAX() MIN() Aggregate functions	Solve
Consider the following SQL table: How many tuples does the following query return?
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
	Medium Multi Select JOIN GROUP BY Sql Join Data Analysis	2 mins SQL	Solve
Consider the following SQL table: How many rows does the following SQL query return?
	Medium nth highest sales Nested queries User Defined Functions	3 mins SQL	Solve
Consider the following SQL table: Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
	Medium Select & IN Nested queries	3 mins SQL	Solve
Consider the following SQL table: Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
	Medium Sorting Ubers Nested queries Join Comparison operators	3 mins SQL	Solve
Consider the following SQL table: What will be the first two tuples resulting from the following SQL command?
	Hard With, AVG & SUM MAX() MIN() Aggregate functions	2 mins SQL	Solve
Consider the following SQL table: How many tuples does the following query return?
	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
	Multi Select JOIN GROUP BY Sql Join Data Analysis	SQL	Medium	2 mins	Solve
Consider the following SQL table: How many rows does the following SQL query return?
	nth highest sales Nested queries User Defined Functions	SQL	Medium	3 mins	Solve
Consider the following SQL table: Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
	Select & IN Nested queries	SQL	Medium	3 mins	Solve
Consider the following SQL table: Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
	Sorting Ubers Nested queries Join Comparison operators	SQL	Medium	3 mins	Solve
Consider the following SQL table: What will be the first two tuples resulting from the following SQL command?
	With, AVG & SUM MAX() MIN() Aggregate functions	SQL	Hard	2 mins	Solve
Consider the following SQL table: How many tuples does the following query return?
	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 & 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.

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Have questions about the Java & SQL Hiring Test?

What is Java & SQL Test?

The Java & SQL Test evaluates a candidate's proficiency in Java and SQL. It is used by recruiters to assess technical skills relevant to Java development and SQL database management.

Can I combine Java & SQL Test with another skill test?

Yes, you can request a custom test that combines the Java & SQL Test with questions from our Spring test. This allows you to assess both Java/SQL skills and Spring framework knowledge in one evaluation.

What topics are evaluated in the Java & SQL Test?

The test covers Java Basics, Object-Oriented Programming, Exceptions, SQL Basics, Database Design, Querying and Manipulating Data, and includes a Java coding question.

How to use Java & SQL Test in my hiring process?

Use this test as a pre-screening tool at the start of your hiring process. Add the assessment link to your job post or email it directly to candidates.

Can I test Java, Spring & SQL together in one test?

Yes, you can evaluate all three skills using our Java, Spring & SQL Test. This helps streamline your recruitment process by assessing multiple competencies in a single test.

What are the main programming tests available?

Other important programming tests include:

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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