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 75402

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 13880

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

Wipro,

7 14722

What is an abstract class?

DBS, Wipro,

7 13092

How can final class be used?

Accenture, Wipro,

5 13848

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

Wipro,

1 13499

Java support what type of parameter passing ?

Wipro,

7 17467

Explain the term serialization?

Wipro,

10 16034

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

Infosys, Wipro,

10 17929

What is Overriding and how can it be used?

Consagous, Wipro,

7 18756

Explain pass by reference and pass by value?

IBM, Wipro,

8 17798

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 11952

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 55207

Is there any need to import java.lang package?

Sun Microsystems,

13 21848

What is UNICODE?

3 7022

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Un-Answered Questions { Core Java }

How do you get the length of a string in java?

558

What is a prefix function.write down a code to compute prefix function.

568

Why chararray() is preferred over string to store the password?

561

What is a stringbuilder?

549

What is fundamental datatype?

562

Is ++ operator is thread safe in java?

555

What is string array?

620

How do you replace a string in java?

583

What are the benefits of operations?

554

Why is java multithreaded?

583

What does file separator do in java?

575

How do you escape json?

577

I want to re-reach and use an object once it has been garbage collected. Define how it’s possible?

609

Are arrays static in java?

618

Can we have any code between try and finally blocks?

593

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