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 74855

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 13698

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

Wipro,

7 14523

What is an abstract class?

DBS, Wipro,

7 12930

How can final class be used?

Accenture, Wipro,

5 13719

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

Wipro,

1 13436

Java support what type of parameter passing ?

Wipro,

7 17294

Explain the term serialization?

Wipro,

10 15798

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

Infosys, Wipro,

10 17719

What is Overriding and how can it be used?

Consagous, Wipro,

7 18586

Explain pass by reference and pass by value?

IBM, Wipro,

8 17599

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 11811

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 54697

Is there any need to import java.lang package?

Sun Microsystems,

13 21635

What is UNICODE?

3 6943


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Un-Answered Questions { Core Java }

What is a static class in java?

564


what is encapsulation in java? Explain

671


What is connection class in java?

518


Write a program to show whether a graph is a tree or not using adjacency matrix.

602


Which eclipse is best for java?

532






What must a class do to implement an interface in java programming?

542


What is the synonym of procedure?

538


Is string a data type in java?

596


What are the two basic ways in which classes that can be run as threads may be defined?

560


What are user defined exceptions?

596


Can a method inside a interface be declared as final?

534


How many types of string data types are there?

563


What is the difference between JDK and JVM?

637


Can we write class inside a class in java?

557


What is the disadvantage of synchronization?

571