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 94802

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 28368

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

Wipro,

7 29045

What is an abstract class?

DBS, Wipro,

8 27490

How can final class be used?

Accenture, Wipro,

5 27260

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

Wipro,

1 26396

Java support what type of parameter passing ?

Wipro,

7 19909

Explain the term serialization?

Wipro,

10 30976

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

Infosys, Wipro,

10 33130

What is Overriding and how can it be used?

Consagous, Wipro,

7 32968

Explain pass by reference and pass by value?

IBM, Wipro,

8 32174

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 25250

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 73556

Is there any need to import java.lang package?

Sun Microsystems,

13 25130

What is UNICODE?

3 8440

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Un-Answered Questions { Core Java }

Where to store local variables?

1038

Can a final method be overloaded?

893

How to print nodes of a Binary tree?

2208

What are meta-annotations?

939

Difference between string s= new string (); and string s = "abv";?

1163

What is locale in java?

978

What is boolean keyword in java?

1080

Garbage collection in java?

960

Can we sort set in java?

916

Are arrays static in java?

1014

Write a java program for binary search?

1013

What are the differences between stringbuffer and stringbuilder?

1005

Can you override static methods?

905

What is command line argument

1163

What are the advantages and disadvantages of reference counting in garbage collection?

977

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