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 9355

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 12865

What is type casting?

2 5725

What is the java project architecture?

IBM,

2294

What Is Resource Leak?

2 5614

In which language JVM (Java Virtual Machine) is implemented

5 9389

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

1 5498

Can I have constructor in Interface?

2 17197

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

Infosys, Nokia,

1 7779

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

WDC,

3 6875

explain the collection in java

WDC,

1 4626

How to implement Singleton

DELL,

6 10199

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 9131

what is collections in java?

4 6569

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

1 5457

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Un-Answered Questions { Core Java }

What are the main features of java?

1020

What is the difference between JDK and JVM?

1340

How will you reverse a singly-link list?

1051

What is a 16 bit word?

1072

What are the properties of thread?

969

Tell me how many ways are there to initialise an integer with a constant.

1156

what is nested class in java?

1228

What is a methodologist?

1140

What is an abstract class and what is it’s purpose?

1012

Is there any way to skip finally block of exception even if some exception occurs in the exception block?

1115

Can an interface extend a class?

1060

What is the maximum length of a url?

1021

What about method local inner classes or local inner classes in java?

1108

Do extraneous variables affect validity?

959

What is meant by oops concept in java?

1053

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