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 74637

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 13616

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

Wipro,

7 14434

What is an abstract class?

DBS, Wipro,

7 12858

How can final class be used?

Accenture, Wipro,

5 13669

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

Wipro,

1 13409

Java support what type of parameter passing ?

Wipro,

7 17213

Explain the term serialization?

Wipro,

10 15721

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

Infosys, Wipro,

10 17620

What is Overriding and how can it be used?

Consagous, Wipro,

7 18495

Explain pass by reference and pass by value?

IBM, Wipro,

8 17539

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 11751

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 54521

Is there any need to import java.lang package?

Sun Microsystems,

13 21538

What is UNICODE?

3 6917

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Un-Answered Questions { Core Java }

which one is more efficient int x; 1. if(x==null) 2.if(null==x) state which one either 1 or 2?

9201

Give some features of interface?

582

Define nashorn in java8.

563

What are the advantages of functions?

517

What is the meaning of course?

581

What restrictions are placed on method overloading in java programming?

568

What is the type of lambda expression?

537

What is ++ a in java?

566

How do you access command-line arguments within the code?

571

Is arraylist an object in java?

598

What is integers and example?

486

What is parsing in java?

527

Is java hashset ordered?

575

Does java isempty check for null?

568

How do you remove an object from an arraylist in java?

460

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