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 3818

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 5989

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

Gspann Technologies, Merrill Lynch, Polaris,

9 38945

What is the purpose of premetive data types in java?

Merrill Lynch, TCS,

2 8273

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

TCS,

7 14576

What is the basic functionality of DataOutput interface in java?

TCS,

2 6168

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

iGate,

9 19618

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

College School Exams Tests, Infosys,

13 21053

What is the difference between overloading and overriding a function?

eG Innovations, Infosys, TCS,

13 24276

when we have to use final class in java?

2 7811

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

2 4587

Life Cycle of Thread

IBM,

4 11108

what is the difference between Cpp And Java

Infosys,

15 28016

what is the use of reference variable

6 22738

What is unicode?

5 9779

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Un-Answered Questions { Core Java }

What is regex java?

1110

write a program that list all permutations of ABCDEF in which A appears before B?

2491

What is method reference in java?

1144

What is final?

1077

What is the difference between class & object?

1018

What are the 6 functions?

975

Can java arraylist hold different types?

1076

What do you mean by scope of variable?

893

What is arraylist class in java?

1068

How do I type unicode?

982

What mechanism does java use for memory management?

978

What are advantages and disadvantages of OOPs?

1140

Is c better than java?

962

What are the 6 boolean operators?

1106

Explain public static void main(string args[]).

1181

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