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 15759

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 18519

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

Hexaware,

5 15781

what is the difference between HashMap And HashTable?

Hexaware,

5 13659

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 72191

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

2 6272

which class to use when concatenating strings in a loop.

IBM,

3 9073

what are depricated methods ?

Satyam,

5 11571

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

Satyam,

6 15458

what is the difference between cd & dvd ?

Lovely Professional University, Satyam, Sibylsys,

30 57851

why java does not support multiple inheritance

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

41 106506

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

4 20896

what is the difference between HashMap and Hashtable

Value Labs, Virtusa,

17 63936

what is the difference between ArrayList and Vector

KPIT, Sasken, Satyam, Span Infotech, Wipro,

19 50335

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

2 8863

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Un-Answered Questions { Core Java }

What is flush buffer?

1133

What is a string token?

1137

How does java pattern compile work?

1029

What is an example of a constant variable?

1160

What is java autoboxing?

1002

Write an algorithm for quick sort?

1096

What is the difference between a method and a function in alice?

1292

What is meant by inheritance and what are its advantages?

1174

What are runtime exceptions?

1231

Which sorting algorithm is in place?

1024

What is fundamental datatype?

1063

What does it mean that strings are immutable?

1189

Can we declare an interface as final?

1117

What does sprintf mean?

1008

Is java call by reference?

1032

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