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 7646

can abstract class have constructor how can you achive this ?

Fidelity,

4 10774

what is difference betwwen hashmap and hashtable ?

Fidelity,

7 12006

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 8121

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

Synechron, TCS,

7 23399

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

1 3295

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

Lampex,

2066

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

Lampex,

2073

how to write a program for chat function using core java

Satyam,

1 5075

why abstract class will have a constructor?

4 8352

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

2089

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

Systematix,

1 4889

basic difference b/w ALL types of JDBC driver.

Systematix,

1 5734

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 5519

what is meaning of JIT?

4 10127

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Un-Answered Questions { Core Java }

Can we have a method name same as class name in java?

1052

What are the disadvantages of object oriented programming?

1278

When a thread is executing synchronized methods , then is it possible to execute other synchronized methods simultaneously by other threads?

1064

explain local datetime api in java8?

1011

What is empty string literal in java?

1057

Can we restart a dead thread in java?

987

Can we override a variable in java?

1014

If a method is declared as protected, where may the method be accessed in java programming?

994

What is the difference between Grid and Gridbaglayout?

1244

What are passing parameters?

1088

Can an object be null?

967

Can we write method inside a method in java?

989

What is keyword auto for?

1186

What is parsing a string?

1172

Can a java program have 2 main methods?

1048

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