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Core Java Interview Questions

Published: 30th May 2005 Read: 26765 times

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Core Java Interview Questions

Latest Questions

1. What is MVC architecture

2. What design patterns have you used

3. What are the differences between ArrayList and a Vector

4. How would you declare a SingleThreaded servlet

5. How are memory leaks possible in Java

6. What are the differences between EJB and Java beans

7. What are STRUTS

8. Explain Servlet and JSP life cycle

9. What would happen if you say this = null

10. What do you like most with Ant

11. Will there be a performance penalty if you make a method synchronized? If so, can you make any design changes to improve the performance

12. How would you implement a thread pool

13. How does serialization work

14. How does garbage collection work

15. What are the differences between AWT and Swing

16. How would you pass a java integer by reference to another function

17. How would you keep track of a session

18. Explain the keywords - native, transient, volatile, finally

19. Differences between HashList and HashMap, Set and List

20. What is the sweep and paint algorithm

21. Can a method be static and synchronized

22. What is EJB

23. What are the differences between C++ and Java

24. How can you do multiple inheritance in Java

25. What is data encapsulation? What does it buy you

26. Would you like to derive data from a base class

27. What is reflection API? How are they implemented

28. What is the primary advantage of XML driven Java Beans

29. What are the primitive types in Java

30. Is there a separate stack for each thread in Java

31. What is heap in Java

32. In Java, how are objects / values passed around

33. Do primitive types have a class representation

34. How all can you free memory

35. Does java do reference counting

36. What does a static inner class mean? How is it different from any other static member

37. How do you declare constant values in java

38. How all can you instantiate final members

39. How is serialization implemented in Java

40. If there are 2 different versions of object streams on disk and only one object definition, how will the JVM reject the wrong one? Can you fool the JVM

41. When you have an object passed to a method and when the object is reassigned to a different one, then is the original reference lost

42. What is phantom memory

43. What are the different kinds of exceptions? How do you catch a Runtime exception

44. What are the differences between JIT and HotSpot

45. What is a memory footprint? How can you specify the lower and upper limits of the RAM used by the JVM? What happens when the JVM needs more memory

46. Does JVM maintain a cache by itself? Does the JVM allocate objects in heap? Is this the OS heap or the heap maintained by the JVM? Why

47. What are the disadvantages of reference counting in garbage collection

48. Is it advisable to depend on finalize for all cleanups

49. What part of MVC does Struts represent

50. When you use a struts framework, where would you place your business logic

51. In a Java Bean inside (1) Action (2) Action Mappings (3) struts-config (4) Separate business tier

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