Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

which method is used to know the status of the Thread?

Honeywell,

9 15522

is this possible to create an array of 0 length? if so how? if not so why? coz we have an array in main() likw this "static void main(String [] s) then what it signifies?

Hexaware, TCS,

3 18424

Is it possible to write static method in abstract class? justyfy your answer?

Hexaware,

5 15619

what is the difference between HashMap And HashTable?

Hexaware,

5 13401

what is the difference between abstract class and Interface?where we can use it in realtime projects?

Agile Software, Cognizant, IBM, Innodata, Logica CMG, Mitosis, Nagarro, Value Chain,

23 71465

How many bits are used to represent unicodde,ASCII,UTF-16 and UTF-8 characters?

2 6180

which class to use when concatenating strings in a loop.

IBM,

3 8953

what are depricated methods ?

Satyam,

5 11357

What is multiple inheritance & can we implement it in java?

Satyam,

6 15262

what is the difference between cd & dvd ?

Lovely Professional University, Satyam, Sibylsys,

30 57054

why java does not support multiple inheritance

Diamond, Euclid, Evergent, KLKJ, Mind Tree, NIIT, SSI Small Scale Industries, Wipro,

41 105155

why to use transient variables when static variables can be used for Serialization

4 20732

what is the difference between HashMap and Hashtable

Value Labs, Virtusa,

17 63416

what is the difference between ArrayList and Vector

KPIT, Sasken, Satyam, Span Infotech, Wipro,

19 49713

what is the difference between @include page and @include file

2 8762

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Un-Answered Questions { Core Java }

Why constructor has no return type?

1104

What is null in java?

990

What is the difference between the final method and abstract method?

1069

What is a buffer in java?

1043

Can static method access instance variables ?

1151

Which collection is sorted in java?

1047

What is externalizable interface?

1115

How can we find the sum of two linked lists using stack in java?

1173

Is array an object in java?

975

How many bytes is a unicode character?

1016

What is illegal identifier in java?

1026

How to display all the prime numbers between 1 and 100

1032

Java is Pass by Value or Pass by Reference?

1052

How to connect to a remote database using Applet?

2561

Does constructor return any value?

1037

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