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

Core Java Interview Questions

Questions Answers Views Company eMail

if i have one string class then how can you achive this class functionality of this class?

Fidelity, iFlex,

3 7802

can abstract class have constructor how can you achive this ?

Fidelity,

4 10945

what is difference betwwen hashmap and hashtable ?

Fidelity,

7 12262

we know that every java prog must follows OOPS Principles. Anybody can answer, HOW THE FOLLOWING PROGRAM FOLLOWS OOPS CONCEPTS i.e, Inheritance,Polymarphism,Encapsulation? class a{ public static void main(String args[]){ System.out.println("Hello World"); } }

3 8243

is memory to the abstract class allocated ..or objects not instantiated

Synechron, TCS,

7 23659

where the static methods will live ,on stack ? can you explain brefly

1 3373

how to write a server program and sending the mails to the server using smtp protocol please help me

Lampex,

2118

how to write a program for sending mails between client and server

Lampex,

2126

how to write a program for chat function using core java

Satyam,

1 5179

why abstract class will have a constructor?

4 8528

how to run ecllipse with jettyserver for windows environment using batch file

2158

can we Connect Applet to Data Base ? with Discriptiom. and also What is Diff. from Applet & Servlet?

Systematix,

1 4982

basic difference b/w ALL types of JDBC driver.

Systematix,

1 5840

perpare on factorypattern,linklist wothout using collection, (multitharding ie create producer/customer therad producer create Queue continuesly,consumer consume queue, consumer wait if queue is full,producer wait if queue is empty),diff betn sleep(1000)&wait(1000) these r the main Q ask in huawei(2008)

Huawei,

1 5622

what is meaning of JIT?

4 10309

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Un-Answered Questions { Core Java }

What do heavy weight components mean in java programming?

1003

What is difference between wait and notify in java?

1207

Is singleton a bad practice?

1112

How does a cookie work in Servlets?

902

Can set contain duplicates?

1055

What are conditionals and its types?

1193

What does compareto () do in java?

1061

Outline the major features of java.

1130

What is the maximum size of hashmap in java?

1061

what is difference between equals and ==?

1128

Can we call the run() method instead of start()?

1092

What is data type modifier?

996

What do you mean by ordered and sorted in collections in java?

1045

Explain about main() method in java ?

1119

Why java is said to be pass-by-value ?

1095

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