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.

30,830 java developer interview questions shared by candidates

1. Java 8 questions 2. Overloading, overriding 3. Exception 4. Internal working of java 8 stream api 5. Java 8 date & time que and internal working Overall easy questions, basic core java interview questions Client interview - hashmap , linked hashmap internal working
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Senior Java Developer

Interviewed at Capgemini

4.1
Nov 17, 2020

1. Java 8 questions 2. Overloading, overriding 3. Exception 4. Internal working of java 8 stream api 5. Java 8 date & time que and internal working Overall easy questions, basic core java interview questions Client interview - hashmap , linked hashmap internal working

Two developers, Ann and Suzy, are waiting for code to compile. Suzy learns that Ann's sister has three children, and asks how old they are. Ann responds, "The product of their ages is 36." Suzy says, "Oh c'mon--I can't figure it out with that!" Ann replies, "Ok, then the sum of their ages is the same as this number right here," and points to a number on the screen. Suzy says, "Nope, still can't do it," and Ann replies, "The oldest is dyslexic." How old are the children? (Order from oldest to youngest)
avatar

Senior Java Developer

Interviewed at Acuitus

4.4
Apr 6, 2010

Two developers, Ann and Suzy, are waiting for code to compile. Suzy learns that Ann's sister has three children, and asks how old they are. Ann responds, "The product of their ages is 36." Suzy says, "Oh c'mon--I can't figure it out with that!" Ann replies, "Ok, then the sum of their ages is the same as this number right here," and points to a number on the screen. Suzy says, "Nope, still can't do it," and Ann replies, "The oldest is dyslexic." How old are the children? (Order from oldest to youngest)

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