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Core Java Interview Questions
Questions Answers Views Company eMail

what do you meant by Runtime Polymorphism?

BVIMR, IBM, Persistent,

13 28562

How to call static method?

Epoch,

4 5838

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

Sai Softech,

8 23617

Difference between abstract class and Interfaces?

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

7 11949

what is the use of declaring constructor as private?

Cyient, IVY Technologies, Sai Softech, Virtusa,

5 10916

Difference between array and arraylist.

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

23 142909

Difference between Hash Table and Hash Map?

Persistent,

10 17211

Features of Java?

4 4166

Difference between overloading and overridding?

4 6069

Keywords in Exceptions?

2 3603

write the hierarchy of component class?

1 2920

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

IBM,

14 42752

what is the difference between multitasking and multithreading?

TCS,

21 71207

why java is not supporting multiple inheritence?

3 4317

what are the diffrences between interface and abstract class?

4 5313


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Un-Answered Questions { Core Java }

What are the two environment variables that must be set in order to run any java programs?

212


Explain the difference between association, aggregation and inheritance relationships.

209


Is it possible to use Semaphore/ Mutex in an Interrupt Handler?

235


Which category the java thread do fall in?

228


Does java arraylist maintain insertion order?

191






Explain different types of thread priorities ?

233


What do you mean by order of precedence and associativity?

213


Explain the difference between an Interface and an Abstract class?

250


If we don’t want some of the fields not to serialize how to do that?

211


What is the difference between quicksort & mergesort? When should they be used? What is their running time?

276


How hashmap works in java?

208


What is tostring () method?

165


What is a nested structure?

154


What is a blocking method in Java?

231


Can we override protected method in java?

185