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 10736

What is JVM ? use of JVM?

BVC, Tech Mahindra,

6 14354

Memory management in JAVA

Tech Mahindra, Wipro,

3 15628

What is constructor

Manforce, Tech Mahindra,

9 11436

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

2 5834

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 9244

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,

3312

how copy the hashmap object into arraylist at java program?

HCL, Wipro,

4 14506

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

3 6607

Nested classes VS Inner classes?

Infosys,

3 6287

waht You know about thread programming?

1 3410

What are Interceptors?

1 5695

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

2336

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 12593

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 4253

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Un-Answered Questions { Core Java }

What is a variable analysis?

1039

What is a variable declaration?

944

Define an enumeration?

994

Differentiate between stringbuffer and stringbuilder in java.

989

What do you meant by active and passive objects?

1032

Can arraylist hold different types java?

938

Explain what are final variable in java?

1034

What is pass by value?

902

What is a function in java?

985

How do you control extraneous variables?

871

What is final method?

1018

Write a program to reverse array in place?

1030

What is the difference between an if statement and a switch statement?

1113

How many bits are used to represent unicode, ascii, utf-16, and utf-8 characters?

1058

What is == in java?

969

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