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 6415

can abstract class have constructor how can you achive this ?

Fidelity,

4 9392

what is difference betwwen hashmap and hashtable ?

Fidelity,

7 9799

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 6440

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

Synechron, TCS,

7 20860

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

1 2018

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

Lampex,

1539

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

Lampex,

1542

how to write a program for chat function using core java

Satyam,

1 4280

why abstract class will have a constructor?

4 6462

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

1482

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

Systematix,

1 4089

basic difference b/w ALL types of JDBC driver.

Systematix,

1 4323

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 4799

what is meaning of JIT?

4 8717

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Un-Answered Questions { Core Java }

What is function declaration?

519

Which java version is latest?

528

Why super is first line in java?

548

What is meant by class loader? How many types are there? When will we use them?

497

What are the important features of Java 10 release?

506

Which package has light weight components?

552

What is public static void main?

561

What is the use of generics? When was it added to the Java development Kit?

546

Explain the scope or life time of class variables or static variables?

506

Where are local variables stored?

503

Can memory leak in java?

572

what is object-oriented programming in java?

580

what is encapsulation in java? Explain

657

What is the difference between notify and notifyall method?

598

What is a package in java? List down various advantages of packages.

744

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