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 do you meant by Runtime Polymorphism?

BVIMR, IBM, Persistent,

13 35999

How to call static method?

Epoch,

4 8829

Difference between ?System.out.println? and ?System.error.println??

Sai Softech,

8 28478

Difference between abstract class and Interfaces?

CTS, iFlex, PA Consulting, Sai Softech, Value Chain,

7 16614

what is the use of declaring constructor as private?

Cyient, IVY Technologies, Sai Softech, Virtusa,

5 15099

Difference between array and arraylist.

Arise Solution, Banca Sella, iFocus, NIC, Sai Softech, Solartis, TCS, Verizon,

23 156763

Difference between Hash Table and Hash Map?

Persistent,

10 22800

Features of Java?

4 7237

Difference between overloading and overridding?

4 8903

Keywords in Exceptions?

2 5312

write the hierarchy of component class?

1 4218

what are the differences between final,finally,finalize methods?

IBM,

14 50637

what is the difference between multitasking and multithreading?

TCS,

21 81475

why java is not supporting multiple inheritence?

3 6416

what are the diffrences between interface and abstract class?

4 7866

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Un-Answered Questions { Core Java }

Can we use string in switch case in java?

1056

What does this () mean in java?

979

If a method is declared as protected, where may the method be accessed in java programming?

994

Why do I need to declare the type of a variable in java?

1080

What are variable arguments or varargs?

1008

What is the difference between ArrayList and Vector? which one is better in Java

1140

Where are global variables stored?

956

give an example for encapsulation?

1047

Why can't you declare a class as protected?

1134

Explain which of the following methods releases the lock when yield(), join(),sleep(),wait(),notify(), notifyall() methods are executed?

1118

Why are constructors used?

1023

Why is stringbuffer not immutable?

1079

Is ruby built on java?

949

How can an object be unreferenced?

1023

What are the two types of exceptions in java? Which are the differences between them?

1100

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