Core Java 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 74161

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 13428

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

Wipro,

7 14221

What is an abstract class?

DBS, Wipro,

7 12682

How can final class be used?

Accenture, Wipro,

5 13541

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

Wipro,

1 13342

Java support what type of parameter passing ?

Wipro,

7 17049

Explain the term serialization?

Wipro,

10 15482

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

Infosys, Wipro,

10 17410

What is Overriding and how can it be used?

Consagous, Wipro,

7 18319

Explain pass by reference and pass by value?

IBM, Wipro,

8 17361

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 11628

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 54012

Is there any need to import java.lang package?

Sun Microsystems,

13 21324

What is UNICODE?

3 6827


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Un-Answered Questions { Core Java }

What is the difference between I ++ and ++ I in java?

485


Can a string be null?

511


What is the purpose of main function in java?

514


whatis Home interface and Remoteinterface? with example?

1521


Why inputstreamreader is used in java?

525






List types of storage classes in java?

593


What is the private method modifier?

555


Explain about fail safe iterators in java?

537


What is null in java?

491


Is constructor inherited?

508


What is immutable state?

474


How does varargs work in java?

576


What is the main purpose of java?

481


How to use string tokenizer class.

593


Difference between concurrent hashmap and hashtable and collections

540