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Java Developer Interview Questions

In your interview for a java developer position, be prepared to answer technical questions that test your understanding of Java basics. Interviewers may also ask open-ended questions to assess your coding and problem-solving abilities. Prepare for non-technical questions that focus on time management, interpersonal communication, and work ethic.

Top Java Developer Interview Questions & How to Answer

Question 1

Question #1: What is the difference between HashTable and HashMap in Java?

How to answer
How to answer: Interviewers use technical questions to assess your formal training and understanding of the Java programming language. Use your answer to demonstrate your communication skills. Even if you have been coding for some time, it can be helpful to review Java basics before your interview.
Question 2

Question #2: Write a program to determine if 243 is an Armstrong number.

How to answer
How to answer: Interviewers use open-ended questions to test your coding skills. This question allows the employer to assess your ability to solve a problem using a Java algorithm. Explain your thinking process as you use a code editor or whiteboard to solve the problem.
Question 3

Question #3: How do you produce quality code when you have several Java projects to complete at once?

How to answer
How to answer: Java developers often juggle multiple projects at the same time. Interviewers use questions such as this to test your time management and organizational skills. Employers are also trying to assess your commitment to quality work. If you have experience as a developer, include examples from your work history that demonstrate high-quality work and effective time management.

30,862 java developer interview questions shared by candidates

They asked to code a small game where 6 knights should hit the one at their left with a random amount of damage of a range. Then they should fight until there's only one knight standing. All actions should be displayed (knight 1 hits 2 with X damage, knight 4 dies, knight 5 wins)
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Java Developer

Interviewed at uberall

3.2★
Jan 26, 2019

They asked to code a small game where 6 knights should hit the one at their left with a random amount of damage of a range. Then they should fight until there's only one knight standing. All actions should be displayed (knight 1 hits 2 with X damage, knight 4 dies, knight 5 wins)

Using Intellij, they provide me with an algorithm to solve. Also they provide me a code to tell what it prints like I was the compiler. In spite of passing the algorithm and all the questions, I did not receive an offer, and to be honest, with the offered wages, I would have passed.
avatar

Senior Software Engineer - Java Developer

Interviewed at Nokia

4★
Sep 24, 2023

Using Intellij, they provide me with an algorithm to solve. Also they provide me a code to tell what it prints like I was the compiler. In spite of passing the algorithm and all the questions, I did not receive an offer, and to be honest, with the offered wages, I would have passed.

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Glassdoor has 30,862 interview questions and reports from Java developer interviews. Prepare for your interview. Get hired. Love your job.