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 15259

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 18287

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

Hexaware,

5 15370

what is the difference between HashMap And HashTable?

Hexaware,

5 13141

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 70720

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

2 6050

which class to use when concatenating strings in a loop.

IBM,

3 8810

what are depricated methods ?

Satyam,

5 11171

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

Satyam,

6 15028

what is the difference between cd & dvd ?

Lovely Professional University, Satyam, Sibylsys,

30 56067

why java does not support multiple inheritance

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

41 103776

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

4 20531

what is the difference between HashMap and Hashtable

Value Labs, Virtusa,

17 62792

what is the difference between ArrayList and Vector

KPIT, Sasken, Satyam, Span Infotech, Wipro,

19 49049

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

2 8657

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Un-Answered Questions { Core Java }

Can we have multiple catch block for a try block?

951

How do you take thread dump in java?

959

What is the difference between normal report & matrix report?

1066

Why is multithreading important?

913

What is the role of garbage collector in java?

923

What is command line argument in java?

1100

What is identifier in java?

1054

What is the concept of multithreading?

952

What is a map? What are the implementations of map?

1055

Is array serializable java?

933

What is a boolean expression in java?

988

What is an escape character in java?

997

What is difference between == and === in js?

974

What is the tradeoff between using an unordered array versus an ordered array?

1185

What happens when heap memory is full?

937

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