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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.

30,904 java developer interview questions shared by candidates

1. What is the method not stopping thread flow?{read(),wait(),notify() these are the options} 2. Program output public class BolleanLocalVariable { public void test(){ boolean b1=true; boolean b2=fix(b1); System.out.println(b1+" "+b2); } public boolean fix(boolean b1) { // TODO Auto-generated method stub b1=false; return b1; } public static void main(String[] args) { // TODO Auto-generated method stub BolleanLocalVariable B= new BolleanLocalVariable(); B.test(); } } 3. Program output public static void main(String[] args) { // TODO Auto-generated method stub int[] a= {3,5,8}; a[1]=7; int[] b=a; System.out.println(a[0]+" "+a[1]+" "+a[2]); System.out.println(b[0]+" "+b[1]+" "+b[2]); } 4.Program output public class FinallyWithSExitDemo { public static void main(String[] args) { // TO DO Auto-generated method stub try{ System.exit(0); }finally{ System.out.println("Hi i am in finally block"); } } } 5. Valid Thread class constructors 6. 7. Longest sub range of pure number 8. Length of unique K elements First Line T Test case Second N,K Elements separated by space Third line N elements with in the range of k 9. Find nth value of provided Palindrome list with the combination of 4 and 5 like 44,55,4545
avatar

Java Developer

Interviewed at DBS Bank

3.8★
Feb 1, 2019

1. What is the method not stopping thread flow?{read(),wait(),notify() these are the options} 2. Program output public class BolleanLocalVariable { public void test(){ boolean b1=true; boolean b2=fix(b1); System.out.println(b1+" "+b2); } public boolean fix(boolean b1) { // TODO Auto-generated method stub b1=false; return b1; } public static void main(String[] args) { // TODO Auto-generated method stub BolleanLocalVariable B= new BolleanLocalVariable(); B.test(); } } 3. Program output public static void main(String[] args) { // TODO Auto-generated method stub int[] a= {3,5,8}; a[1]=7; int[] b=a; System.out.println(a[0]+" "+a[1]+" "+a[2]); System.out.println(b[0]+" "+b[1]+" "+b[2]); } 4.Program output public class FinallyWithSExitDemo { public static void main(String[] args) { // TO DO Auto-generated method stub try{ System.exit(0); }finally{ System.out.println("Hi i am in finally block"); } } } 5. Valid Thread class constructors 6. 7. Longest sub range of pure number 8. Length of unique K elements First Line T Test case Second N,K Elements separated by space Third line N elements with in the range of k 9. Find nth value of provided Palindrome list with the combination of 4 and 5 like 44,55,4545

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