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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 79827

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 15578

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

Wipro,

7 16250

What is an abstract class?

DBS, Wipro,

8 14802

How can final class be used?

Accenture, Wipro,

5 14894

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

Wipro,

1 14174

Java support what type of parameter passing ?

Wipro,

7 19039

Explain the term serialization?

Wipro,

10 17848

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

Infosys, Wipro,

10 19816

What is Overriding and how can it be used?

Consagous, Wipro,

7 20182

How is serialization used generally ?

3 8895

How are Swing and AWT be differentiated?

Wipro,

3 9604

Explain pass by reference and pass by value?

IBM, Wipro,

8 19174

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 12911

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 59128


Un-Answered Questions { Java J2EE }

What are the different mode that servlets can be used?

809


What are all the protocols supported by httpservlet?

955


What is @entity in spring boot? : Spring Boot

286


What are different types of calculation usages used in wcs?

729


Is spring boot a mvc? : Spring Boot

310


Is spring boot a framework?

237


How transient variable is different from volatile variable?

833


What is the use of using enum to declare a constant?

828


What about plug-in?

682


What is difference between local variable and global variable?

772


What does entitymanager merge do?

275


How to prevent dirty checking in hibernate?

300


What is hibernate and its advantages?

249


What is difference between oauth and oauth2?

301


Difference between hibernate session merge() vs update()?

305