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Top 30 Java Interview Questions for Testers

by Interview Kickstart Team in Interview Questions
November 1, 2023
Unlock the fail-proof way of preparing for Test Engineering interviews
You can download a PDF version of  
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Top 30 Java Interview Questions for Testers

About The Author!
Vartika Rai
Vartika Rai
Product Manager at Interview Kickstart. With exceptional experience with tech giants like Microsoft, she is a curious lady for the vast scope of NLP, Big data analytics, ML and data science.

A career in Java testing is sure to be a rewarding one if you’re working for a FAANG+ company. As a Java tester, your primary role is to test Java/J2EE applications during the development cycle. Java interview questions for testers mostly revolve around programming theory and coding. As testers are also involved with the overall performance of applications, Java testing interview questions around systems design also feature in technical interviews.

In this piece, we’ll look at some popular Java interview questions for testers. We’ll first look at some Java interview questions and answers for experienced testers, followed by general programming- and design-related questions.

If you’re a software engineer, coding engineer, software developer, engineering manager, or tech lead preparing for tech interviews, check out our technical interview checklist, interview questions page, and salary negotiation e-book to get interview-ready!

Having trained over 13,500 software engineers, we know what it takes to crack the most challenging tech interviews. Since 2014, Interview Kickstart alums have landed lucrative offers from FAANG and Tier-1 tech companies, with an average salary hike of 49%. The highest-ever offer received by an IK alum is a whopping $933,000!

At IK, you get the unique opportunity to learn from expert instructors who are hiring managers and tech leads at Google, Facebook, Apple, and other top Silicon Valley tech companies.  Our reviews will tell you how we’ve shaped the careers of thousands of professionals aspiring to take their careers to new heights.

Want to nail your next tech interview? Sign up for our FREE Webinar.

Let’s go ahead and look at some Java interview questions and answers for experienced testers, along with popular sample Java interview questions for testers. These questions will help you form a concrete idea of the type of questions asked in technical interviews at FAANG+ companies.

Here’s what we’ll cover in this article:

  • Popular Java Interview Questions and Answers for Experienced Testers
  • Java Coding Interview Questions for Testers
  • Java Systems Design Interview Questions for Testers
  • FAQs on Java Interview Questions for Testers

Popular Java Interview Questions and Answers for Experienced Testers

In this section, we’ll look at some popular Java interview questions and answers for experienced testers.

Q1. What OOPs concepts are important while performing manual testing of Java applications?

This is one of the most common Java interview questions for testers. OOPs is an important programming paradigm that is applicable to testing applications in JavaScript and J2EE. The important OOPs concepts applicable in testing include - Abstraction, Encapsulation, Polymorphism, Inheritance, Method Overriding, Method Overloading, and Data Binding.

Important OOP concepts for Testers

Q2. What are some tools used in testing applications built using Java frameworks?

Some popular Java testing tools used to test applications coded in the language include:

  • JBehave
  • JUnit
  • Serenity
  • Selenium
  • Gauge
  • Mockito
Tools used in testing applications

Q3. What are some advantages of employing Java test automation frameworks?

This is one of the most popular Java interview questions for testers. The main advantages of using Java test automation frameworks include:

  • Test automation frameworks help to carry out the testing process seamlessly by improving speed and accuracy
  • Automation testing allows for code reusability, a core feature necessary while testing J2EE applications.
  • Test reports can be retrieved automatically after test cases are executed.

Q4. Which are the different types of test automation frameworks for testing applications?

This is a common Java interview question for testers asked in technical interviews. The main types of test automation frameworks for testing applications coded in Java are:

  • Keyword-Driven Testing Frameworks
  • Hybrid Testing Frameworks
  • Data-Driven Testing Frameworks
  • Modular Testing Frameworks
4 types of test automation frameworks for testing applications coded in Java

Q5. What type of test cases are mostly required to be automated?

This is one of the most popular Java interview questions for testers. Test cases that require to be automated include:

  • Sanity Test Cases
  • Smoke Test Cases
  • Regression Test Cases

Java Coding Interview Questions for Testers

Java interview questions for testers include questions in coding concepts, mostly those pertaining to core data structures and algorithms. Coding is an important part of testing interviews. The main topics that feature in Java interview questions for testers at coding interviews:

Let’s go ahead and look at some popular Java interview questions for testers in coding:

  1. For a given array of size N, write a code to print the reverse of the array
  2. For a given array A, write a code to delete the duplicate elements in the array
  3. For a given array Arr[] containing integer elements, write a code to find the minimum and maximum elements of the array
  4. For a given array of size N containing distinct integer numbers, write a code to sort the array in the wave fashion
  5. From a given array containing integer values, write a code to find the maximum subarray of non-negative numbers
  6. For a given String S, write a program to remove duplicate elements from the String
  7. For a given String S, write a code to find the minimum number of elements or characters that need to be inserted to convert it into a palindrome
  8. For a given String S, write a program to find the length of the longest Substring with distinct values
  9. For a given String S, write a code to remove successive duplicate characters recursively
  10. For two strings, A and B, write a program to figure out if B can be obtained by rotating A in at least two places
  11. Write a code to add two numbers represented by Linked Lists
  12. Write a function to remove the nth node from a Linked List
  13. Write a program to swap adjacent nodes in a Linked List
  14. Write a code to reverse a Linked List from position X to position Y
  15. For a given Linked List, write a code to return the node value where the cycle in question begins
  16. For a given binary tree, write a function to connect nodes that are at the same level
  17. For a given binary tree T, write a function to find its spiral order traversal
  18. For a given binary tree, write a program that traces its vertical traversal
  19. For a given binary tree T, write a code to print the bottom view of the tree from left to right
  20. You're given the root of a binary tree T. Write a program to find out of it is a Binary Search Tree or not

Java Systems Design Interview Questions for Testers

Systems design is an important part of testing interviews. Java interview questions for testers consist of questions in distributed systems design, mostly asked at on-site interviews.

Let’s go ahead and look at some popular Java interview questions for testers in distributed systems design.

Before that, here are the essential topics to prepare for the design interview:

  • Basics of Systems Design
  • Caching
  • Storage and retrieval
  • MapReduce and distributed file systems
  • Concurrency
  • Basics of API modeling
  • Network protocols
  • Scalable systems and scaling applications
  • Replication
  • Sharding techniques
  • Measuring the performance of scalable systems

Below are some sample Java interview questions for testers in distributed systems design.

  1. How would you design a file-sharing service like Dropbox?
  2. What is your approach to designing a cloud communications system?
  3. How would you design a chatbot service?
  4. How would you ensure that your system is secure to end-users?
  5. How would you design a system like Instagram?
  6. What factors would you account for while designing an e-commerce system?
  7. What is your approach to designing a cab-hailing service?

Practicing such Java interview questions for testers is key to preparing for and cracking your next Java Testing interview. Include these questions in your prep, and you will surely see results. All the best!

FAQs on Java Interview Questions for Testers

Q1. What is the interview process in general for Java testers are FAANG+ companies?

The interview process for Java testers involves a Technical Phone Screen Round and an On-site interview round comprising coding and design rounds.

Q2. What type of Java interview questions for testers are asked in coding interviews?

Java interview questions for testers are mostly around programming theory, automation frameworks, testing test cases, testing tools, coding, problem-solving, and distributed systems design.

Q3. Which are the two fundamental ways to carry out application testing using Java?

The two most common ways to carry out application testing are Functional Testing and Non-Functional Testing.

Q4. Are behavioral interview questions part of Java interview questions for testers at FAANG+ interviews?

Behavioral questions are an essential part of interviews for testers. You can expect behavioral interview questions during on-site interviews. Questions are primarily around leadership, cooperation, integrity, ethics, and work-life balance.

Q5. Which are the important coding concepts to prepare for testing interviews?

Java interview questions for testers consist of problems in coding. Your problem-solving is fundamentally tested through your ability to solve problems around core data structures and algorithms. The important coding concepts include - Arrays, Strings, Linked Lists, Recursion, Hash Tables, Dynamic Programming, Trees, Graphs, and Greedy Algorithms.

Get Ready for Your Upcoming Technical Interview

If you’ve begun preparing for your next technical interview, register for Interview Kickstart’s technical interview webinar and get ahead by understanding foolproof and advanced strategies from industry experts.  These reviews from our alums will tell you exactly how we’ve helped thousands of students to scallop their professional careers by helping them crack technical interviews at the biggest companies.

Sign Up Now to Uplevel Your Career!


Last updated on: 
November 1, 2023
Author
Vartika Rai
Product Manager at Interview Kickstart | Ex-Microsoft | IIIT Hyderabad | ML/Data Science Enthusiast. Working with industry experts to help working professionals successfully prepare and ace interviews at FAANG+ and top tech companies
The fast well prepared banner

Top 30 Java Interview Questions for Testers

A career in Java testing is sure to be a rewarding one if you’re working for a FAANG+ company. As a Java tester, your primary role is to test Java/J2EE applications during the development cycle. Java interview questions for testers mostly revolve around programming theory and coding. As testers are also involved with the overall performance of applications, Java testing interview questions around systems design also feature in technical interviews.

In this piece, we’ll look at some popular Java interview questions for testers. We’ll first look at some Java interview questions and answers for experienced testers, followed by general programming- and design-related questions.

If you’re a software engineer, coding engineer, software developer, engineering manager, or tech lead preparing for tech interviews, check out our technical interview checklist, interview questions page, and salary negotiation e-book to get interview-ready!

Having trained over 13,500 software engineers, we know what it takes to crack the most challenging tech interviews. Since 2014, Interview Kickstart alums have landed lucrative offers from FAANG and Tier-1 tech companies, with an average salary hike of 49%. The highest-ever offer received by an IK alum is a whopping $933,000!

At IK, you get the unique opportunity to learn from expert instructors who are hiring managers and tech leads at Google, Facebook, Apple, and other top Silicon Valley tech companies.  Our reviews will tell you how we’ve shaped the careers of thousands of professionals aspiring to take their careers to new heights.

Want to nail your next tech interview? Sign up for our FREE Webinar.

Let’s go ahead and look at some Java interview questions and answers for experienced testers, along with popular sample Java interview questions for testers. These questions will help you form a concrete idea of the type of questions asked in technical interviews at FAANG+ companies.

Here’s what we’ll cover in this article:

  • Popular Java Interview Questions and Answers for Experienced Testers
  • Java Coding Interview Questions for Testers
  • Java Systems Design Interview Questions for Testers
  • FAQs on Java Interview Questions for Testers

Popular Java Interview Questions and Answers for Experienced Testers

In this section, we’ll look at some popular Java interview questions and answers for experienced testers.

Q1. What OOPs concepts are important while performing manual testing of Java applications?

This is one of the most common Java interview questions for testers. OOPs is an important programming paradigm that is applicable to testing applications in JavaScript and J2EE. The important OOPs concepts applicable in testing include - Abstraction, Encapsulation, Polymorphism, Inheritance, Method Overriding, Method Overloading, and Data Binding.

Important OOP concepts for Testers

Q2. What are some tools used in testing applications built using Java frameworks?

Some popular Java testing tools used to test applications coded in the language include:

  • JBehave
  • JUnit
  • Serenity
  • Selenium
  • Gauge
  • Mockito
Tools used in testing applications

Q3. What are some advantages of employing Java test automation frameworks?

This is one of the most popular Java interview questions for testers. The main advantages of using Java test automation frameworks include:

  • Test automation frameworks help to carry out the testing process seamlessly by improving speed and accuracy
  • Automation testing allows for code reusability, a core feature necessary while testing J2EE applications.
  • Test reports can be retrieved automatically after test cases are executed.

Q4. Which are the different types of test automation frameworks for testing applications?

This is a common Java interview question for testers asked in technical interviews. The main types of test automation frameworks for testing applications coded in Java are:

  • Keyword-Driven Testing Frameworks
  • Hybrid Testing Frameworks
  • Data-Driven Testing Frameworks
  • Modular Testing Frameworks
4 types of test automation frameworks for testing applications coded in Java

Q5. What type of test cases are mostly required to be automated?

This is one of the most popular Java interview questions for testers. Test cases that require to be automated include:

  • Sanity Test Cases
  • Smoke Test Cases
  • Regression Test Cases

Java Coding Interview Questions for Testers

Java interview questions for testers include questions in coding concepts, mostly those pertaining to core data structures and algorithms. Coding is an important part of testing interviews. The main topics that feature in Java interview questions for testers at coding interviews:

Let’s go ahead and look at some popular Java interview questions for testers in coding:

  1. For a given array of size N, write a code to print the reverse of the array
  2. For a given array A, write a code to delete the duplicate elements in the array
  3. For a given array Arr[] containing integer elements, write a code to find the minimum and maximum elements of the array
  4. For a given array of size N containing distinct integer numbers, write a code to sort the array in the wave fashion
  5. From a given array containing integer values, write a code to find the maximum subarray of non-negative numbers
  6. For a given String S, write a program to remove duplicate elements from the String
  7. For a given String S, write a code to find the minimum number of elements or characters that need to be inserted to convert it into a palindrome
  8. For a given String S, write a program to find the length of the longest Substring with distinct values
  9. For a given String S, write a code to remove successive duplicate characters recursively
  10. For two strings, A and B, write a program to figure out if B can be obtained by rotating A in at least two places
  11. Write a code to add two numbers represented by Linked Lists
  12. Write a function to remove the nth node from a Linked List
  13. Write a program to swap adjacent nodes in a Linked List
  14. Write a code to reverse a Linked List from position X to position Y
  15. For a given Linked List, write a code to return the node value where the cycle in question begins
  16. For a given binary tree, write a function to connect nodes that are at the same level
  17. For a given binary tree T, write a function to find its spiral order traversal
  18. For a given binary tree, write a program that traces its vertical traversal
  19. For a given binary tree T, write a code to print the bottom view of the tree from left to right
  20. You're given the root of a binary tree T. Write a program to find out of it is a Binary Search Tree or not

Java Systems Design Interview Questions for Testers

Systems design is an important part of testing interviews. Java interview questions for testers consist of questions in distributed systems design, mostly asked at on-site interviews.

Let’s go ahead and look at some popular Java interview questions for testers in distributed systems design.

Before that, here are the essential topics to prepare for the design interview:

  • Basics of Systems Design
  • Caching
  • Storage and retrieval
  • MapReduce and distributed file systems
  • Concurrency
  • Basics of API modeling
  • Network protocols
  • Scalable systems and scaling applications
  • Replication
  • Sharding techniques
  • Measuring the performance of scalable systems

Below are some sample Java interview questions for testers in distributed systems design.

  1. How would you design a file-sharing service like Dropbox?
  2. What is your approach to designing a cloud communications system?
  3. How would you design a chatbot service?
  4. How would you ensure that your system is secure to end-users?
  5. How would you design a system like Instagram?
  6. What factors would you account for while designing an e-commerce system?
  7. What is your approach to designing a cab-hailing service?

Practicing such Java interview questions for testers is key to preparing for and cracking your next Java Testing interview. Include these questions in your prep, and you will surely see results. All the best!

FAQs on Java Interview Questions for Testers

Q1. What is the interview process in general for Java testers are FAANG+ companies?

The interview process for Java testers involves a Technical Phone Screen Round and an On-site interview round comprising coding and design rounds.

Q2. What type of Java interview questions for testers are asked in coding interviews?

Java interview questions for testers are mostly around programming theory, automation frameworks, testing test cases, testing tools, coding, problem-solving, and distributed systems design.

Q3. Which are the two fundamental ways to carry out application testing using Java?

The two most common ways to carry out application testing are Functional Testing and Non-Functional Testing.

Q4. Are behavioral interview questions part of Java interview questions for testers at FAANG+ interviews?

Behavioral questions are an essential part of interviews for testers. You can expect behavioral interview questions during on-site interviews. Questions are primarily around leadership, cooperation, integrity, ethics, and work-life balance.

Q5. Which are the important coding concepts to prepare for testing interviews?

Java interview questions for testers consist of problems in coding. Your problem-solving is fundamentally tested through your ability to solve problems around core data structures and algorithms. The important coding concepts include - Arrays, Strings, Linked Lists, Recursion, Hash Tables, Dynamic Programming, Trees, Graphs, and Greedy Algorithms.

Get Ready for Your Upcoming Technical Interview

If you’ve begun preparing for your next technical interview, register for Interview Kickstart’s technical interview webinar and get ahead by understanding foolproof and advanced strategies from industry experts.  These reviews from our alums will tell you exactly how we’ve helped thousands of students to scallop their professional careers by helping them crack technical interviews at the biggest companies.

Sign Up Now to Uplevel Your Career!


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Recession-proof your Career

Recession-proof your Test Engineering Career

Attend our free webinar to amp up your career and get the salary you deserve.

Ryan-image
Hosted By
Ryan Valles
Founder, Interview Kickstart
blue tick
Accelerate your Interview prep with Tier-1 tech instructors
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360° courses that have helped 14,000+ tech professionals
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57% average salary hike received by alums in 2022
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100% money-back guarantee*
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