Java Tutorials - Free Technical Questions 9

Large collection of Java interview questions

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

2. What is user defined exception ?

3. What do you know about the garbage collector ?

4. What is the difference between C++ & Java ?

5. Explain RMI Architecture?

6. How do you communicate in between Applets & Servlets ?

7. What is the use of Servlets ?

8. What is JDBC? How do you connect to the Database ?

9. In an HTML form I have a Button which makes us to open another page in 15 seconds. How will do you that ?

10. What is the difference between Process and Threads ?

11. What is the difference between RMI & Corba ?

12. What are the services in RMI ?

13. How will you initialize an Applet ?

14. What is the order of method invocation in an Applet ?

15. When is update method called ?

16. How will you pass values from HTML page to the Servlet ?

17. Have you ever used HashTable and Dictionary ?

18. How will you communicate between two Applets ?

19. What are statements in JAVA ?

20. What is JAR file ?

21. What is JNI ?

22. What is the base class for all swing components ?

23. What is JFC ?

24. What is Difference between AWT and Swing ?

25. Considering notepad/IE or any other thing as process, What will happen if you start notepad or IE 3 times? Where 3 processes are started or 3 threads are started ?

26. How does thread synchronization occurs inside a monitor ?

27. How will you call an Applet using a Java Script function ?

28. Is there any tag in HTML to upload and download files ?

29. Why do you Canvas ?

30. How can you push data from an Applet to Servlet ?

31. What are 4 drivers available in JDBC ?

32. How you can know about drivers and database information ?

33. If you are truncated using JDBC, How can you know ..that how much data is truncated ?

34. And What situation , each of the 4 drivers used ?

35. How will you perform transaction using JDBC ?

36. In RMI, server object first loaded into the memory and then the stub reference is sent to the client ? or whether a stub reference is directly sent to the client ?

37. Suppose server object is not loaded into the memory, and the client request for it , what will happen?

38. What is serialization ?

39. Can you load the server object dynamically? If so, what are the major 3 steps involved in it ?

40. What is difference RMI registry and OSAgent ?

41. To a server method, the client wants to send a value 20, with this value exceeds to 20,. a message should be sent to the client ? What will you do for achieving for this ?

42. What are the benefits of Swing over AWT ?

43. Where the CardLayout is used ?

44. What is the Layout for ToolBar ?

45. What is the difference between Grid and GridbagLayout ?

46. How will you add panel to a Frame ?

47. What is the corresponding Layout for Card in Swing ?

48. What is light weight component ?

49. Can you run the product development on all operating systems ?

50. What is the webserver used for running the Servlets ?

51. What is Servlet API used for connecting database ?

52. What is bean ? Where it can be used ?

53. What is difference in between Java Class and Bean ?

54. Can we send object using Sockets ?

55. What is the RMI and Socket ?

56. How to communicate 2 threads each other ?

57. What are the files generated after using IDL to Java Compilet ?

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