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 15471

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 18384

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

Hexaware,

5 15568

what is the difference between HashMap And HashTable?

Hexaware,

5 13350

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 71282

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

2 6152

which class to use when concatenating strings in a loop.

IBM,

3 8923

what are depricated methods ?

Satyam,

5 11314

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

Satyam,

6 15216

what is the difference between cd & dvd ?

Lovely Professional University, Satyam, Sibylsys,

30 56848

why java does not support multiple inheritance

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

41 104827

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

4 20697

what is the difference between HashMap and Hashtable

Value Labs, Virtusa,

17 63295

what is the difference between ArrayList and Vector

KPIT, Sasken, Satyam, Span Infotech, Wipro,

19 49594

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

2 8743

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Un-Answered Questions { Core Java }

What is the file extension for java?

1074

What does i ++ mean in Java?

953

What is java developer skills?

980

How variables are declared?

978

What is better- service oriented or batch oriented solutions?

2220

what are the high-level thread states? : Java thread

1016

What is return used for in java?

1026

Can we assign null to double in java?

1015

enlist some features of jdk.

955

What happens when you invoke a thread’s interrupt method while it is sleeping or waiting?

980

What is strings in java?

1042

What is parameters example?

1030

Is ++ operator thread-safe in java?

1184

Why are lists ordered in java?

1010

Where are the local variables stored?

1073

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