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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.

30,911 java developer interview questions shared by candidates

2nd Technical Discussion: [Virtual 2 Persons] Quick Brief about current project Questions were on Core java ,System Design,REST architecture. 1) File upload : Design a system for uploading huge file [100GB] 2) why REST ? protocol over which REST runs 3) OutOfMemoryError : How to resolve this in PROD
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Java Applications Developer

Interviewed at Smarsh

3.5★
Jul 14, 2020

2nd Technical Discussion: [Virtual 2 Persons] Quick Brief about current project Questions were on Core java ,System Design,REST architecture. 1) File upload : Design a system for uploading huge file [100GB] 2) why REST ? protocol over which REST runs 3) OutOfMemoryError : How to resolve this in PROD

The interviewer asked for a coding question via sharing the screen and seeing an ide for the output. Few java basics questions and then spring-boot questions like What are annotations? Explain @Controller Annotations with syntax. Then asked few questions on HTTP methods.PUT vs POST? Coding question: Given a string aaaaabbcdddffaazzh . Your output should be 5a2bc3d2f2a2zh
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Java Full Stack Developer

Interviewed at ASM Technologies

3.7★
Nov 29, 2022

The interviewer asked for a coding question via sharing the screen and seeing an ide for the output. Few java basics questions and then spring-boot questions like What are annotations? Explain @Controller Annotations with syntax. Then asked few questions on HTTP methods.PUT vs POST? Coding question: Given a string aaaaabbcdddffaazzh . Your output should be 5a2bc3d2f2a2zh

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Glassdoor has 30,911 interview questions and reports from Java developer interviews. Prepare for your interview. Get hired. Love your job.