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 15478

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 18388

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

Hexaware,

5 15579

what is the difference between HashMap And HashTable?

Hexaware,

5 13364

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 71322

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

2 6164

which class to use when concatenating strings in a loop.

IBM,

3 8931

what are depricated methods ?

Satyam,

5 11318

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

Satyam,

6 15226

what is the difference between cd & dvd ?

Lovely Professional University, Satyam, Sibylsys,

30 56860

why java does not support multiple inheritance

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

41 104938

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

4 20701

what is the difference between HashMap and Hashtable

Value Labs, Virtusa,

17 63314

what is the difference between ArrayList and Vector

KPIT, Sasken, Satyam, Span Infotech, Wipro,

19 49627

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

2 8744

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Un-Answered Questions { Core Java }

What is the use of inner class?

1046

What is final method in java?

1037

Can we create constructor in abstract class ?

1059

Is alive method in java?

986

Define the term string pool?

1010

Can we have try block without catch block?

1031

What are the important features of Java 10 release?

987

How are variables stored?

986

How do you reverse a string in java?

1139

Does java return by reference?

1015

what is use of functional interface in java 8?

1026

What about anonymous inner classes in java?

1038

Give differences between Quicksort & Mergesort. When should these sorts be used and what is their running time?

1070

Is java owned by oracle?

1019

What is a Transient Object?

1085

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