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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 6439

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 10407

What is type casting?

2 4032

What is the java project architecture?

IBM,

1399

What Is Resource Leak?

2 3054

In which language JVM (Java Virtual Machine) is implemented

5 6299

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

1 4000

Can I have constructor in Interface?

2 14638

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

Infosys, Nokia,

1 6388

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

WDC,

3 4496

explain the collection in java

WDC,

1 3241

How to implement Singleton

DELL,

6 6351

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 6485

what is collections in java?

4 3965

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

1 4113


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Un-Answered Questions { Core Java }

explain the concept of virtual method invocation in polymorphism in detail?

1379


Why java uses the concept of the string literal?

206


Is set thread safe java?

156


What are accessor methods in java?

169


What are the different types of collections in java?

164






What is the properties class?

206


How do you pass by reference?

178


What are loops in java?

210


Why main method is static in java?

199


Explain the init method?

196


What is the final keyword in java?

222


What is immutability in java?

162


Can we restart a thread already started in java?

233


Explain different ways of creating a thread?

207


What is a subsequence of a string?

174