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

Core Java Interview Questions

Questions Answers Views Company eMail

How to decrease number of hashings in has

1 3815

Is it safe for adding 10,00,000 records/objects to HashMap?, i.e is it safe to add millions of objects to HashMap?

2 5986

What is the difference between pageContext and page implicit objects in jsp?

Gspann Technologies, Merrill Lynch, Polaris,

9 38944

What is the purpose of premetive data types in java?

Merrill Lynch, TCS,

2 8272

Howmany number of objects we can store in an ArrayList. Is there any limit?

TCS,

7 14572

What is the basic functionality of DataOutput interface in java?

TCS,

2 6167

Can we inherit the constructor in a Class?please give one example.

iGate,

9 19610

Why do we use public static with the main function in Java?

College School Exams Tests, Infosys,

13 21050

What is the difference between overloading and overriding a function?

eG Innovations, Infosys, TCS,

13 24268

when we have to use final class in java?

2 7810

how to minimize the functionality to will not force garbage collector?

2 4584

Life Cycle of Thread

IBM,

4 11105

what is the difference between Cpp And Java

Infosys,

15 27996

what is the use of reference variable

6 22735

What is unicode?

5 9777

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Un-Answered Questions { Core Java }

Is space a char?

927

Is an object null?

974

Is null false in java?

1193

What are byte codes?

1221

What is the main difference between java platform and other platforms?

1102

What is the difference between throw and throws keywords?

1052

What is the final method?

1073

What is maximum size of arraylist in java?

1031

explain different ways of using thread? : Java thread

1013

What is procedure writing?

975

What do you understand by soft reference?

1056

What is java util list?

960

Where are the card layouts used?

1068

What is the relationship between class and object?

1045

How does linkedlist work in java?

929

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