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

Core Java Interview Questions

Questions Answers Views Company eMail

There can be a abstract class without abstract methods, but what is the need to declare a class abstract if it doesn't contain abstract methods?

HCL,

5 9182

I was asked to draw the class diagram for the below scenario which should obey OOPS concept. A Portal is to be developed for a school , which has 3 main divisions viz , Education , Admin & Trust. Each division has 2 sub divisions Kinder Garden & Higer Secondary.

Amtek, Huawei,

3 12732

What is type casting?

2 5624

What is the java project architecture?

IBM,

2244

What Is Resource Leak?

2 5500

In which language JVM (Java Virtual Machine) is implemented

5 9224

Why we should declare the variables as static and final in interfaces?

1 5421

Can I have constructor in Interface?

2 17060

How can we create a object of a class without using new operator.

Infosys, Nokia,

1 7711

I dont want to use serialzable in java is there any another concept so plz tell me

WDC,

3 6753

explain the collection in java

WDC,

1 4534

How to implement Singleton

DELL,

6 9952

How does marker interface provides functionality to the implemented class ? or How dose maker interface gets the functionalities as serialization or cloning.

Cap Gemini,

4 8922

what is collections in java?

4 6413

how can i kill thread without stop() and destroy()

1 5380

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Un-Answered Questions { Core Java }

How does thread synchronization occurs inside a monitor? What levels of synchronization can you apply?

962

What is singleton service?

973

What is a parameter used for?

963

What is bufferedreader in java?

1046

What is the size of integer?

1094

Which collection does not allow duplicates in java?

980

How can we find the sum of two linked lists using stack in java?

1151

What is parseint?

1014

What is arraylist class in java?

1062

State some advantages of java?

1236

What are annotations in java?

1095

Why call by value prevents parameter value change?

1076

What are different data structures in java?

1042

What is finally in Java?

1079

Which sorting is best in java?

1001

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