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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.

30,830 java developer interview questions shared by candidates

5. The user of this class expected the output “Num: 1000000”. They got something else. What went wrong and how would you fix it? public class Test { public final static int NUMTHREADS = 1000; public final static int NUMLOOP = 1000; public static int num = 0; static class Mythread extends Thread { @Override public void run() { for (int i = 0; i < NUMLOOP; i++) { ++num; } } } public static void main(String argv[]) { Mythread threads[] = new Mythread[NUMTHREADS]; for (int i = 0; i < NUMTHREADS; ++i) { threads[i] = new Mythread(); threads[i].start(); } try { for (int i = 0; i < NUMTHREADS; ++i) { threads[i].join(); } } catch (InterruptedException e) { } System.out.println("Num: " + num); } }
avatar

Java Engineer

Interviewed at Nextlabs

3.8★
Jan 12, 2012

5. The user of this class expected the output “Num: 1000000”. They got something else. What went wrong and how would you fix it? public class Test { public final static int NUMTHREADS = 1000; public final static int NUMLOOP = 1000; public static int num = 0; static class Mythread extends Thread { @Override public void run() { for (int i = 0; i < NUMLOOP; i++) { ++num; } } } public static void main(String argv[]) { Mythread threads[] = new Mythread[NUMTHREADS]; for (int i = 0; i < NUMTHREADS; ++i) { threads[i] = new Mythread(); threads[i].start(); } try { for (int i = 0; i < NUMTHREADS; ++i) { threads[i].join(); } } catch (InterruptedException e) { } System.out.println("Num: " + num); } }

Programming Round: 1) Write a program count 1 to 50 number. Every multiple of 3 it should print " Manhattan " and Every 5 multiple it should print " Associate " and combination of 3 and 5 multiple. it should print "Manhattan Associate". 2) How to create class for Smartphone feature using oops concept. Databse: They Given Three table : shellar name,Customer,order: 1) find out all shellarename who ever purches Maruti car. 2) find out all shellername who ever purches Honda and indika car.
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Software Engineer On Java Technologies Having I Yr Experiance

Interviewed at Manhattan Associates

3.8★
Feb 13, 2016

Programming Round: 1) Write a program count 1 to 50 number. Every multiple of 3 it should print " Manhattan " and Every 5 multiple it should print " Associate " and combination of 3 and 5 multiple. it should print "Manhattan Associate". 2) How to create class for Smartphone feature using oops concept. Databse: They Given Three table : shellar name,Customer,order: 1) find out all shellarename who ever purches Maruti car. 2) find out all shellername who ever purches Honda and indika car.

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