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Top 1000 Java Interview Questions & Answers: Includes Spring, Hibernate,…

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Welcome to our comprehensive guide on the top 1000 Java interview questions and answers! This list includes questions on a wide range of topics, including Java basics, object-oriented programming, Spring framework, Hibernate, and more. Whether you’re preparing for a job interview or just looking to brush up on your Java skills, this list will help you ace your next interview.

Java Basics:

1. What is Java?
2. What are the key features of Java?
3. What is the difference between JDK, JRE, and JVM?
4. Explain the main components of Java programming language.
5. What is the difference between a class and an object in Java?
6. What is the difference between == and .equals() method in Java?
7. What is the difference between method overloading and method overriding?
8. What is the difference between abstract class and interface in Java?
9. What is the difference between final, finally, and finalize in Java?
10. What is the difference between StringBuffer and StringBuilder in Java?

Object-Oriented Programming:

11. What are the principles of object-oriented programming?
12. What is inheritance in Java?
13. What is polymorphism in Java?
14. What is encapsulation in Java?
15. What is abstraction in Java?
16. Explain the concept of method overriding and method overloading.
17. What is a constructor in Java?
18. What is the difference between static and non-static methods in Java?
19. What is the difference between super and this keyword in Java?
20. What is the difference between interface and abstract class in Java?

Spring Framework:

21. What is the Spring framework and its key features?
22. Explain the different modules of the Spring framework.
23. What is dependency injection and how is it implemented in Spring?
24. What are the different types of dependency injection in Spring?
25. What is the difference between @Component, @Service, @Repository, and @Controller annotations in Spring?
26. What is the Spring Bean lifecycle?
27. What is Spring Boot and its advantages?
28. What is Spring Security and how is it implemented in a Spring application?
29. What is Spring AOP and how is it used in Spring applications?
30. What is the difference between singleton and prototype scope in Spring?

Hibernate:

31. What is Hibernate and its key features?
32. Explain the Hibernate architecture.
33. What is the difference between Hibernate and JDBC?
34. What is Hibernate mapping and its types?
35. What is the difference between Hibernate criteria and HQL?
36. What is the difference between save() and persist() methods in Hibernate?
37. What is the difference between get() and load() methods in Hibernate?
38. What is lazy loading in Hibernate?
39. What is the difference between first-level and second-level cache in Hibernate?
40. What is the difference between merge() and update() methods in Hibernate?

These are just a few of the 1000 Java interview questions and answers covered in our comprehensive guide. Whether you’re a beginner or an experienced Java developer, this list will help you prepare for your next interview and enhance your Java skills. Good luck!
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