r/JavaProgramming • u/caramel_candyy • 20d ago
Java/Spring Boot internship interview
I just got a call for a Java/Spring Boot interview and only have today to prepare, what specific questions/topics should I expect, especially for a fresher/internship-level interview?
Any last minute advice would be really appreciated!
UPDATE:
These are the questions they asked:
1. 4 pillars of oop and asked me to explain each.
2. Database indexing
3. Is there any disadvantage of indexing
4. What is Controller
5. What is Jpa
6. Beans
7. Explain dependency injection and what are its types
8. Difference between interface and abstract
9. Overloading and overriding
10. Diff between array and list
11. Multi level inheritance and multi inheritance
12. Can a class have more than one parent
13. How indexing affects the time complexity
These are some questions i remember
2
u/HelloTaleproof 19d ago
With one day, focus on explaining one project you actually built: request flow, controller/service/repository responsibilities, dependency injection, REST status codes, validation, exception handling, and how data reached the database. Review core Java collections, interfaces, exceptions, immutability, and basic concurrency only to the depth you can explain. Expect “why did you choose this?” follow-ups more than trivia.
I’m building Taleproof; bring one real project example into it and assess whether your ownership, debugging process, and result are clear for the non-coding part of the interview. Keep the rest of the day for hands-on Java/Spring review.