Mostly asked J2ee and Java questions

Hi Friend, If you are going to attend the java/j2ee interview this questions are the most repeated one.prepare this questions.I am sure u come up with offer letter.

1) oops – concepts

2) abstract class and interface difference

3) final keyword, final class, final method, final variable.

4) Marker interface, Tagged interface ex: serializable

5) Polymorphisum, types : static, dynamic defination.

6) Inheritance

7) String , String buffer difference

8) Exception hierarchy.

9) Checked , unchecked exceptions differences

10) How to create our own exception.

11) Collection package.

12) List, set Interface difference

13) Vector, arraylist difference

14) Hashmap , hash table difference

15) Collection.sort method.

16) Serializable concept

17) Types of jdbc drivers

18) Type 4 driver

19) Transaction isolation in JDBC

20) Addbatch(), executebatch() method in statement object.

21) Resultset cursor types.

22) Statement, prepared statement differences.

23) Callable statement concept

24) Servlet creations.

25) Service methods, doGet, doPost differences.

26) Servlet extends singlethread model concept

27) Request dispatcher concept

28) requestNamedDispatcher method in request object, and requestDispatcher method in request object differences.

29) Request dispatcher object forward method and response.sendRedirect method differences.

30) How to httpsession object.

31) request.getSession(true), request.getSession(false) method difference

32) How to create cookies.

33) How to set max life time to cookie.( ans: In cookie object setMaxAge method is there)

34) How to session time out in session object .( Ans: setMaxInActiveInterval method)

35) In web.xml servlet mappings

36) Session time out in web.xml, Here 30 is in minutes

30

37) in requestdispatcher forward, include methods differences.

38) Generic Servlet, HttpServlet differences.

39) How to create servlet using HttpServlet class, Servlet Interface.

40) ServletConfig, ServletContext differences.

41) Session management.

42) response.encodeURL() method use.

43) Jsp action pages.

44) Jsp directives

45) <%@taglib directive

46) <%@ page include=””/>, and < %@ include file=””/> differences

47) , differences.

48) In Jsp predefined objects.

49)

above scope attribute values=”request, response,session,page” differences,uses

50) how to make comments that can visible in jsp page at runtime. <%!-- --%>

51) How to make comments that can not be visible. <%-- … --%>

52) Struts tag liberearites

53) Struts-bean.tld, struts-logic.tld, inthat tag libraries and tags uses.

54) Tag library configuraing in web.xml

55) Actionform, dynaactionform, validatorform, dynavalidatorform uses.

56) Action, DispatchAction,forward action classes uses.

57) Strus-config,xml tages

58)

59) tags uses

60) validation.xml uses.

61) types of ejbs.

62) Descriptions about stateless session, stateful session beans.

63) Xml parsers DOM parser , SAX parser differences.

64) MVC architectchures.

65) Design patterns like front controller, session façade, service locator, singelton , DAO .

66) project version control- WinCVS 3.1.

67) Some of the UML concepts. Sequence diagrams, class diagrams.

68) When servlet object created.