Top 50 Java Interview Questions 2025 | Spring Boot, Multithreading, Java 8

Are you preparing for a Java developer interview in 2025? You've come to the right place! This video is your ultimate guide to revising the most frequently asked Java interview questions, complete with clear, concise answers.

Whether you're a recent graduate or an experienced developer, this complete revision will boost your confidence and help you master the core concepts needed to ace your next technical interview. We'll cover everything from Core Java fundamentals to advanced topics like Spring Boot and system design principles.

👨‍💻 **TOPICS & QUESTIONS COVERED IN THIS VIDEO:**
**Core Java:** What is the JVM? `final` vs. `finally` vs. `finalize`, `String` immutability, and more.
**Object-Oriented Programming (OOP):** Explaining the four pillars (Inheritance, Polymorphism, Encapsulation, Abstraction) with real-world examples.
**Collections Framework:** The difference between `List`, `Set`, and `Map`. How does `HashMap` work internally?
**Exception Handling:** Checked vs. Unchecked exceptions.
**Multithreading:** The thread lifecycle, `synchronized` keyword, and common concurrency questions.
**Java 8+ Features:** In-depth explanation of Streams, Lambdas, and the `Optional` class.
**Bonus:** Tips for approaching coding challenges and system design questions.

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⏰ **TIMESTAMPS:**

Core Java - Must-Know Questions
Deep Dive into Object-Oriented Programming (OOP)
The Collections Framework Explained
Handling Exceptions Like a Pro
Multithreading & Concurrency Questions
Modern Java 8+ Features (Streams, Lambdas)
Top Spring & Spring Boot Interview Questions
Bonus: Final Tips for Interview Success!

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🔗 **HELPFUL RESOURCES:**

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👍 **READY FOR YOUR NEXT ROLE?**
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