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

Core Java Interview Questions

Questions Answers Views Company eMail

Explain your academic project?

Accenture, Levonsys, SDF, TCS, Tech Mahindra,

2 10835

What is JVM ? use of JVM?

BVC, Tech Mahindra,

6 14527

Memory management in JAVA

Tech Mahindra, Wipro,

3 15754

What is constructor

Manforce, Tech Mahindra,

9 11685

when everything can be done by static block then why do we use main method?.

2 5951

why we are calling j2se why not j1se or j3se or j4se..etc is there any reason.. can u please explain it... i shocked in my interview when they asked this question please explain ans

Infosys,

2 9342

Java openings 3 - 5 years, Lnt Infotech. requirements - core java, J2ee, struts, hibernate Interview Date:- 19 March 2011 Time:- 9:00 AM to 12:00 Pm Interview Location - L & T Infotech, Manapakkam, Chennai Refererral PS NO:- 291649 (Please mention this when u fill the form only then u will be considered for interview) Documents Required:- Latest Resume, Photograph and last 3 payslips Mail me on vasan2211@gmail.com once u appear for interview

L&T,

3345

how copy the hashmap object into arraylist at java program?

HCL, Wipro,

4 14653

can we access the method of class without creating the object of the class

3 6707

Nested classes VS Inner classes?

Infosys,

3 6391

waht You know about thread programming?

1 3487

What are Interceptors?

1 5779

i would like to attend for an interview of datalab technologies company i want to know the pattern of imnterview.

2374

Suppose i have two threads t1 and t2 are running.How the main thread will know that the two threads t1,t2 execution has completed?

Subex,

2 12678

I have a string like _a01_a02_a03_ and another string like _2_1.5_4_ as input.I want to extract a01,a02... to a string array and 2,1.5,etc to a double array with a01 corresponds to 2 and a02 to 1.5 etc. Need code in core java.. Can you do it?

Cognizant,

1 4318

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Un-Answered Questions { Core Java }

What is thread synchronization in java?

890

Differentiate between array list and vector in java.

1112

Which class is the superclass for all the classes?

1019

What is thread pool in java with example?

995

How do you escape a string?

988

What does \ mean in regex?

1210

What is the difference between import java.util.date and java .util?

1052

What are the 6 functions?

966

What is a list in java?

944

How to perform merge sort in java?

1056

What is the purpose of javac exe?

1088

Can we override private constructor in java?

970

What is nan in java?

990

Why doesn't the java library use a randomized version of quicksort?

993

Can you tell me range of byte?

990

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