Intermediate Java Interview Questions
Ready to go deeper? These 17 intermediate Java interview questions bridge the gap between the basics and senior-level depth, focusing on the practical patterns and trade-offs interviewers probe for mid-level roles.
17 Java questions
- 1What is REST API in Java?Intermediate
- 2What is the difference between heap and stack memory?Intermediate
- 3What is garbage collection in Java?Intermediate
- 4What is Spring Framework?Intermediate
- 5What is dependency injection in Java?Intermediate
- 6What is File Handling in Java?Intermediate
- 7What are Java Streams?Intermediate
- 8What is synchronization in Java?Intermediate
- 9What is multithreading in Java?Intermediate
- 10What is equals and hashCode contract?Intermediate
- 11How does HashMap work internally?Intermediate
- 12What are Collections in Java?Intermediate
- 13Difference between method overloading and overridingIntermediate
- 14What are Java OOP pillars in detail?Intermediate
- 15Java Interview Question 5 (Free)Intermediate
- 16Java Interview Question 2 (Free)Intermediate
- 17Java Advanced Interview Question 8Intermediate
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Frequently asked questions
How many intermediate Java interview questions are there?
This page covers 17 intermediate-level Java interview questions, each with a short answer, a deeper explanation, code examples, common mistakes and follow-up questions.
Are these Java questions suitable for intermediate interviews?
Yes. Every question is tagged intermediate difficulty and chosen to match what interviewers expect at that level, so you can focus your preparation without wading through questions that are too easy or too hard.
How should I practise these Java questions?
Read the short answer first, attempt the question yourself, then expand the detailed explanation and real-world example. Review the common mistakes and follow-up questions to make sure you can handle interviewer probing.