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 3742

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 5890

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

Gspann Technologies, Merrill Lynch, Polaris,

9 38695

What is the purpose of premetive data types in java?

Merrill Lynch, TCS,

2 8162

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

TCS,

7 14357

What is the basic functionality of DataOutput interface in java?

TCS,

2 6071

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

iGate,

9 19366

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

College School Exams Tests, Infosys,

13 20677

What is the difference between overloading and overriding a function?

eG Innovations, Infosys, TCS,

13 23872

when we have to use final class in java?

2 7739

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

2 4485

Life Cycle of Thread

IBM,

4 10972

what is the difference between Cpp And Java

Infosys,

15 27531

what is the use of reference variable

6 22525

What is unicode?

5 9593

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Un-Answered Questions { Core Java }

What is externalizable interface?

1069

What are the characteristics of Final,Finally and Finalize keywords.

1135

Can we instantiate interface in java?

1102

Is null == null in java?

1054

what are the states associated in the thread? : Java thread

1013

What is internal variable?

981

What is <> used for in java?

1089

Is this valid in java ? Can we instantiate interface in java?

936

What is map in java?

959

What Is Query Throttling in java?

968

Which is better stringbuffer or stringbuilder?

881

What does method mean?

988

What is int short for?

985

how to deploy apache tomcat server to weblogic server in java

2056

Is array a class in java?

941

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