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Java J2EE Interview Questions
Questions Answers Views Company eMail

What is garbage collection in Java, and how can it be used ?

Accenture, HCL, Infosys, Sara, SITS, TCS, Wipro,

32 70128

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 12028

Differentiate constructor and a method and how are it be used?

Wipro,

7 12790

What is an abstract class?

DBS, Wipro,

7 11388

How can final class be used?

Accenture, Wipro,

5 12700

By what default value is an object reference declared as an instance variable?

Wipro,

1 12788

Java support what type of parameter passing ?

Wipro,

7 15780

Explain the term serialization?

Wipro,

10 13954

Is there is any error if you have multiple main methods in the same class?

Infosys, Wipro,

10 15916

What is Overriding and how can it be used?

Consagous, Wipro,

7 17160

How is serialization used generally ?

3 6891

How are Swing and AWT be differentiated?

Wipro,

3 7826

Explain pass by reference and pass by value?

IBM, Wipro,

8 16067

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 10747

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 50339


Un-Answered Questions { Java J2EE }

How many characters is 2 bytes?

354


A stateful session bean implementing the sessionsynchronization interface is deployed on the weblogic server. Which of the callback methods may be invoked on the bean? : BEA Weblogic

407


Difference between session and sessionfactory in hibernate?

64


What is the use of getGeneratedKeys() method in Statement?

362


Why interceptors are used in spring?

111






What are the differences between the java collection and the java list? : java collections

418


Explain about struts relation to html tags?

377


Is it necessary to register a controller command in cmdreg table?

334


List some key actors in persistence api.

393


What is method reference?

333


What is drivermanagerdatasource in spring?

84


what are the activation groupworks?

1498


Can we write multiple catch blocks under single try block?

423


What is jms message?

345


What is the use of spring data jpa?

75