Java Developer Interviews

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.

30,900 java developer interview questions shared by candidates

Store the elements in a stack and have a function that returns the minimum value without iterating again over it. Design an auto-complete mechanism similar to google's autocomplete mechanism. What are default methods in Interfaces in Java 8 , why are they needed? If a class extends two interfaces having the same default method , what will happen then How will you make an Employee class as your HashMap key.
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Java Software Engineer

Interviewed at Accenture

3.7
Apr 7, 2021

Store the elements in a stack and have a function that returns the minimum value without iterating again over it. Design an auto-complete mechanism similar to google's autocomplete mechanism. What are default methods in Interfaces in Java 8 , why are they needed? If a class extends two interfaces having the same default method , what will happen then How will you make an Employee class as your HashMap key.

2nd F2F Questions:- Difference between == and equals operator Why String is immutable - Explain with example What is String Constant Pool What is DeadLock , Synchronization , Use of Transient and Volatile Keyword Runnable vs Thread Questions in Advanced concepts if you know them-> I didn't ;) SQL :- Simple DML & DDL queries , Query to join two tables What is Normalization and it types What is ACID
avatar

Java Developer

Interviewed at Thinkitive Technologies

4.5
Aug 27, 2019

2nd F2F Questions:- Difference between == and equals operator Why String is immutable - Explain with example What is String Constant Pool What is DeadLock , Synchronization , Use of Transient and Volatile Keyword Runnable vs Thread Questions in Advanced concepts if you know them-> I didn't ;) SQL :- Simple DML & DDL queries , Query to join two tables What is Normalization and it types What is ACID

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Glassdoor has 30,900 interview questions and reports from Java developer interviews. Prepare for your interview. Get hired. Love your job.