1. What are the differences between JDK, JRE, and JVM?
2. Explain the difference between an abstract class and an interface.
3. What is the difference between checked and unchecked exceptions in Java?
4. What is the purpose of the final keyword in Java? How is it used?
5. How does garbage collection work in Java?
6. What is the difference between == and .equals() method in Java?
7. Explain the concept of method overloading and method overriding in Java.
8. What is the difference between ArrayList and LinkedList in Java?
9. How does multithreading work in Java? Explain Thread and Runnable interfaces.
10. What is synchronization in Java? How is it achieved?
11. What is the use of the static keyword in Java?
12. What is the difference between HashMap and HashTable in Java?
13. Explain the concept of inheritance in Java. How is it implemented?
14. What is the purpose of the super keyword in Java?
15. Explain the difference between StringBuilder and StringBuffer classes.
16. What is the purpose of the try, catch, and finally blocks in Java exception handling?
17. What are access modifiers in Java? Explain their types and visibility.
18. How does polymorphism work in Java?
19. Explain the this keyword in Java. What is its significance?
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