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Top 20 Java 8 Interview Questions and Answers

28/Jul/2021 | 5 minutes to read


Here is a List of essential Java 8 Interview Questions and Answers for Freshers and mid level of Experienced Professionals. All answers for these Java 8 questions are explained in a simple and easiest way. These basic, advanced and latest Java 8 questions will help you to clear your next Job interview.

Java 8 Interview Questions and Answers

These interview questions are targeted for Java 8. You must know the answers of these frequently asked Java 8 interview questions to clear the interview.

1. Why is Java 8 so popular?

2. List some Java 8 features.

For more visit Java 8 features.

3. What are Functional Interfaces?

4. What are Lambda Expressions?

5. What is the Stream API in Java 8?

6. What is Java 8 Time API?

7. What are the Collection API improvements in Java 8?

8. What is the difference between flatmap and map methods in Java 8?

9. What is ConcurrentHashMap? How does it work?

10. What is the use of Concurrency API in Java 8?

11. What is the ExecutorService?

12. What is the advantage of Lock interface over synchronized block in Java?

13. How to handle Hash collisions?

For more visit Handle Hash Collisions.

14. What is Metaspace in Java 8?

15. Explain Stream API implementation with an example.

Some General Interview Questions for Java 8

1. How much will you rate yourself in Java 8?

When you attend an interview, Interviewer may ask you to rate yourself in a specific Technology like Java 8, So It's depend on your knowledge and work experience in Java 8.

2. What challenges did you face while working on Java 8?

This question may be specific to your technology and completely depends on your past work experience. So you need to just explain the challenges you faced related to Java 8 in your Project.

3. What was your role in the last Project related to Java 8?

It's based on your role and responsibilities assigned to you and what functionality you implemented using Java 8 in your project. This question is generally asked in every interview.

4. How much experience do you have in Java 8?

Here you can tell about your overall work experience on Java 8.

5. Have you done any Java 8 Certification or Training?

It depends on the candidate whether you have done any Java 8 training or certification. Certifications or training are not essential but good to have.


We have covered some frequently asked Java 8 Interview Questions and Answers to help you for your Interview. All these Essential Java 8 Interview Questions are targeted for mid level of experienced Professionals and freshers.
While attending any Java 8 Interview if you face any difficulty to answer any question please write to us at Our IT Expert team will find the best answer and will update on the portal. In case we find any new Java 8 questions, we will update the same here.