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Core Java Interview Questions
Questions Answers Views Company eMail

Explain your academic project?

Accenture, Levonsys, SDF, TCS, Tech Mahindra,

2 10848

What is JVM ? use of JVM?

BVC, Tech Mahindra,

6 14556

Memory management in JAVA

Tech Mahindra, Wipro,

3 15784

What is constructor

Manforce, Tech Mahindra,

9 11748

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

2 5972

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 9360

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,

3362

how copy the hashmap object into arraylist at java program?

HCL, Wipro,

4 14688

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

3 6726

Nested classes VS Inner classes?

Infosys,

3 6412

waht You know about thread programming?

1 3498

What are Interceptors?

1 5787

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

2387

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 12695

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 4325


Post New Core Java Questions

Un-Answered Questions { Core Java }

Can You Have Virtual Functions In Java?

1153


how a programmer confirms that the data submitted has been succesfully inserted into the database(either oracle or my sql).. How a programmer confirm if there is any problem with the program he wrote for insertion... ANS:--- >executeupdate method is having boolean return type, if anything goes wrong in data insertion or data updation, it would return false. otherwise, if it successfully inserts data into the database, it would return true NOW HOW TO I CHECK IN MY DURING EXECUTION WHETHER IT RETURNS TRUE OR FALSE... WELL IT WILL DISPLAY ANY MESSAGE OR NOT

2433


What are parameters in a method?

1109


Why arraylist is not synchronized in java example?

1070


What is the difference between arraylist and hashset in java?

1155


When should I use singleton?

1041


What about features of local inner class?

1070


Why synchronization is important in java?

1047


What does arrays sort do in java?

1025


Is there any way to find whether software installed in the system is registered by just providing the .exe file? I have tried the following code but its just displaying the directory structure in the registry. Here the code : package com.msi.intaller; import java.util.Iterator; import ca.beq.util.win32.registry.RegistryKey; import ca.beq.util.win32.registry.RootKey; public class RegistryFinder { public static void main(String... args) throws Exception { RegistryKey.initialize(RegistryFinder.class.getResource("jRe gistryKey.dll").getFile()); RegistryKey key = new RegistryKey(RootKey.HKLM, "Software\\ODBC"); for (Iterator subkeys = key.subkeys(); subkeys.hasNext();) { RegistryKey subkey = subkeys.next(); System.out.println(subkey.getName()); // You need to check here if there's anything which matches "Mozilla FireFox". } } }

1804


What is continuity of a function?

1094


What is the escape character in java?

996


What is the java reflection api? Why it’s so important to have?

981


What are java annotations?

1167


Objects or references which of them gets garbage collected?

970