Beginners Java Questions

1. What are the OOPS concepts in Java ?

2. What is meant by encapsulation ? Explain with an example

3. What is meant by inheritance ? Explain with an example

4. What is meant by polymorphism ? Explain with an example

5. Is multiple inheritance allowed in Java ? Why ?

6. What is meant by Java interpreter ?

7. What is meant by JVM ?  How JVM Works?

8. What is a compilation unit ?

9. What is meant by identifiers ?

10. What are the different types of modifiers ?

11. What are the access modifiers in Java ?

12. What are the primitive data types in Java ?

13. What is meant by a wrapper class ?

14. What is meant by static variable and static method ?

15. What is meant by Garbage collection ?

16. What is meant by abstract class

17.What is meant by final class, methods and variables ?

18. What is meant by interface ?

19. What is meant by a resource leak ?

20. What is the difference between interface and abstract class ?

21. What is the difference between public private, protected and static ?

23. What is meant by method overloading ?

24. What is meant by method overriding ?

25. What is singleton class ?

26. What is the difference between an array and a vector ?

27. What is meant by constructor ?

28. What is meant by type casting ?

29. What is the difference between final, finally and finalise ?

30. What is a default package ?

31. What is meant by a super class and how can you call a superclass 

32. What is anonymous class ?

33. Name interfaces without a method ?

34. What is the use of an interface ?

35. What is the difference between an Abstract class and Interface ?

36. What is user defined exception ?

37. What do you know about the garbage collector ?

38.  what  is  native  keyword  in Java?

39 . Explain JVM  architecture ?.

40 . What  is  difference between  path and classpath ? 

41.  What  is  method ambiguity . How  ambiguous overloaded     method  call 

resolve in java ?.