12/Jul/2021 | 5 minutes to read
java
Here is a List of essential Core Java Interview Questions and Answers for Freshers and mid level of Experienced Professionals. All answers for these Core Java questions are explained in a simple and easiest way. These basic, advanced and latest Core Java questions will help you to clear your next Job interview.
These interview questions are targeted for Core Java. You must know the answers of these frequently asked Core Java interview questions to clear the interview.
1. Explain something about Java.
2. What is Bytecode in Java?
3. What is the use of wrapper class in Java?
4. What is a Just-in-time (JIT) compiler?
5. How will you differentiate ArrayList from Array in Java?
6. Explain method overloading and overriding in Java.
7. What is Deep, Shallow and Lazy copy in Java?
8. Explain Multithreading with an example.
9. Explain final, finally and finalize methods in Java.
10. Differentiate Comparable vs comparator.
11. Explain try, catch and finally.
12. How does a HashMap handle different collection items with the same hash code?
For more visit Different items with the same hash code.
13. Differentiate String, StringBuffer and StringBuilder in Java.
14. How will you differentiate Error and Exception?
15. Explain Exception Handling hierarchy.
16. How to throw a custom exception with an error object?
17. Differentiate HashTable and ConcurrentHashMap.
18. Explain NullPointerException in Java. How to fix it?
19. Explain the type of exceptions in Java.
20. Can we use a catch block without a try block?
21. Can we use a try block without a catch block?
1. How much will you rate yourself in Core Java?
When you attend an interview, Interviewer may ask you to rate yourself in a specific Technology like Core Java, So It's depend on your knowledge and work experience in Core Java. The interviewer expects a realistic self-evaluation aligned with your qualifications.
2. What challenges did you face while working on Core Java?
The challenges faced while working on Core Java projects are highly dependent on one's specific work experience and the technology involved. You should explain any relevant challenges you encountered related to Core Java during your previous projects.
3. What was your role in the last Project related to Core Java?
This question is commonly asked in interviews to understand your specific responsibilities and the functionalities you implemented using Core Java in your previous projects. Your answer should highlight your role, the tasks you were assigned, and the Core Java features or techniques you utilized to accomplish those tasks.
4. How much experience do you have in Core Java?
Here you can tell about your overall work experience on Core Java.
5. Have you done any Core Java Certification or Training?
Whether a candidate has completed any Core Java certification or training is optional. While certifications and training are not essential requirements, they can be advantageous to have.
We have covered some frequently asked Core Java Interview Questions and Answers to help you for your Interview. All these Essential Core Java Interview Questions are targeted for mid level of experienced Professionals and freshers.
While attending any Core Java Interview if you face any difficulty to answer any question please write to us at info@qfles.com. Our IT Expert team will find the best answer and will update on the portal. In case we find any new Core Java questions, we will update the same here.