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 36026

How to call static method?

Epoch,

4 8839

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

Sai Softech,

8 28489

Difference between abstract class and Interfaces?

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

7 16637

what is the use of declaring constructor as private?

Cyient, IVY Technologies, Sai Softech, Virtusa,

5 15109

Difference between array and arraylist.

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

23 156813

Difference between Hash Table and Hash Map?

Persistent,

10 22816

Features of Java?

4 7246

Difference between overloading and overridding?

4 8913

Keywords in Exceptions?

2 5320

write the hierarchy of component class?

1 4218

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

IBM,

14 50661

what is the difference between multitasking and multithreading?

TCS,

21 81511

why java is not supporting multiple inheritence?

3 6427

what are the diffrences between interface and abstract class?

4 7870

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Un-Answered Questions { Core Java }

What is the largest number a double can hold?

1047

What is difference between stringbuffer and string?

966

What will happen if non-synchronized method calls a static synchronized method and what kind of lock it acquires?

1114

What is a substitution variable?

1029

Why we go for collections in java?

981

What's the difference between int and integer in java?

1168

What is jit compiler in java?

1110

Is java a security risk?

1048

What is 32 bit float?

997

what is difference betweem home interface and remote interface?

2634

What is an infinite loop? How infinite loop is declared?

1112

What exactly is methodology?

924

Which programming language is most secure?

1000

What is local declaration?

972

What is the difference between member variables initialization and assignment in a constructor?

1281

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