Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

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 78795

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 15132

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

Wipro,

7 15874

What is an abstract class?

DBS, Wipro,

8 14411

How can final class be used?

Accenture, Wipro,

5 14603

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

Wipro,

1 13990

Java support what type of parameter passing ?

Wipro,

7 18600

Explain the term serialization?

Wipro,

10 17371

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

Infosys, Wipro,

10 19321

What is Overriding and how can it be used?

Consagous, Wipro,

7 19806

Explain pass by reference and pass by value?

IBM, Wipro,

8 18779

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 12658

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 58157

Is there any need to import java.lang package?

Sun Microsystems,

13 23216

What is UNICODE?

3 7529

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Un-Answered Questions { Core Java }

Can we serialize singleton class?

768

How do you add an arraylist to an array in java?

724

Is main is a keyword?

789

Is java pass by value or pass by reference?

747

How do you override a method in java?

747

Which sort is best in java?

734

What is the exact difference in between Unicast and Multicast object? Where will it be used?

801

What is array and arraylist in java?

773

Can we have this () and super () together?

794

Can we use switch statement with strings?

800

What is a protected class in java?

753

What is empty list in java?

828

When to use runnable interface vs thread class in java?

748

Explain 5 io best practices?

797

What causes memory leak in java?

695

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