Core Java Interview Questions
Questions Answers Views Company eMail

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

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

32 60272

Differentiate Vector and ArrayList?

Wipro, Max Telecom,

6 8978

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

Wipro,

7 9575




What is an abstract class?

Wipro, DBS,

7 8404

How can final class be used?

Wipro, Accenture,

5 10291

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

Wipro,

1 11411

Java support what type of parameter passing ?

Wipro,

7 12853

Explain the term serialization?

Wipro,

10 10765




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

Wipro, Infosys,

10 12204

What is Overriding and how can it be used?

Consagous, Wipro,

7 14475

Explain pass by reference and pass by value?

IBM, Wipro,

8 12950

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 8566

What happens when a main method is declared as private?

L&T, DELL, Infosys, Sun Microsystems,

22 39688

Is there any need to import java.lang package?

Sun Microsystems,

13 16265

What is UNICODE?

3 4977


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Un-Answered Questions { Core Java }

How do I know if java is installed?

12


Why Java is not pure Object Oriented language?

67


What is garbage collection? Can it be forced to run?

57


Will the compiler creates a default constructor if I have a parameterized constructor in the class?

56


What is use of valueof () in java?

13






Is main a keyword in java?

12


What is a variable in java?

13


Explain the importance of finally block in java?

37


What is the full form of jpeg?

17


What does %4d mean in java?

8


What is udp in java?

10


What is the base class of all exception classes?

33


What is string manipulation?

12


What is parse method?

12


What is 32 bit float?

11