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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.

30,885 java developer interview questions shared by candidates

In 1st technical they have just asked basic OOPS concept. like inheritance, abstraction, encapsulation, polymorphism and volatile keyword In 2nd Technical interview director asked me to solve most complex query. after that he has given me one JAVA problem statement which consist of use of many OOPS concept in one code. I have written code successfully.
avatar

Java Developer

Interviewed at eQ Technologic

4.1★
Apr 8, 2016

In 1st technical they have just asked basic OOPS concept. like inheritance, abstraction, encapsulation, polymorphism and volatile keyword In 2nd Technical interview director asked me to solve most complex query. after that he has given me one JAVA problem statement which consist of use of many OOPS concept in one code. I have written code successfully.

First Round: Go Through R.S.Agarwal Second Round: Go through Indiabix- MCQs Third Round : No of Squares in a square Program to print prime numbers HR: Willing to work up in startup environment? Tell me about yourself? Ready to work for 2years
avatar

Java Developer

Interviewed at OptiRisk India

3.5★
Nov 5, 2016

First Round: Go Through R.S.Agarwal Second Round: Go through Indiabix- MCQs Third Round : No of Squares in a square Program to print prime numbers HR: Willing to work up in startup environment? Tell me about yourself? Ready to work for 2years

Say you have a microservice scaled up to multiple instances, processing client requests. You want all the requests related to a specific client to be processed by a single instance. How would you achieve this and how would that affect your database?
avatar

Java Developer

Interviewed at Weavr

4.3★
May 28, 2022

Say you have a microservice scaled up to multiple instances, processing client requests. You want all the requests related to a specific client to be processed by a single instance. How would you achieve this and how would that affect your database?

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Glassdoor has 30,885 interview questions and reports from Java developer interviews. Prepare for your interview. Get hired. Love your job.