Intro:
Java is still one of the most popular languages asked in technical interviews.
Even in 2025, recruiters test candidates with a set of classic but tricky Java questions.
Here are 10 questions you should never skip.
🔹 1. Difference between JDK, JRE, and JVM
Expect follow-ups on execution flow.
🔹 2. Explain OOP concepts in Java
Encapsulation, Inheritance, Polymorphism, Abstraction.
🔹 3. What is the difference between == and .equals()?
Trick question in almost every interview.
🔹 4. Difference between HashMap and Hashtable
Interview tip: Mention synchronization.
🔹 5. Explain final, finally, and finalize()
A favorite “confusion” question.
🔹 6. Checked vs Unchecked Exceptions
Mention compile-time vs runtime.
🔹 7. What are Threads in Java?
Be ready to explain lifecycle + synchronization.
🔹 8. Difference between ArrayList and LinkedList
Time complexity discussion is expected.
🔹 9. Explain Garbage Collection in Java
Interview tip: Mention different GC algorithms.
🔹 10. What is Spring Boot and why is it popular?
Modern interviews always touch this.
✅ Final Thoughts
If you can answer these 10 questions with clarity and real-world examples, you’ll stand out in Java interviews in 2025.
👉 Call to Action:
I’ve compiled Java interview cheat sheets, sample answers, and coding exercises here:
FullStackPrep.dev – Java Interview Prep Guide
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