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 9366

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 12877

What is type casting?

2 5727

What is the java project architecture?

IBM,

2296

What Is Resource Leak?

2 5627

In which language JVM (Java Virtual Machine) is implemented

5 9389

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

1 5502

Can I have constructor in Interface?

2 17200

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

Infosys, Nokia,

1 7781

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

WDC,

3 6882

explain the collection in java

WDC,

1 4626

How to implement Singleton

DELL,

6 10204

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 9142

what is collections in java?

4 6573

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

1 5461

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Un-Answered Questions { Core Java }

What is instance means in java?

1098

What is the access scope of protected access specifier?

1048

Write a regular expression to validate a password. A password must start with an alphabet and followed by alphanumeric characters; its length must be in between 8 to 20.

1093

These static constructors are correct ? class A { statc intA() { } static A(int x,int y) { } static A(int x) { } }

1142

Is assembly language a low level language?

1032

Can java program run without jre?

1065

What is flag in java?

1049

What is difference between array and arraylist in java?

1040

What is the integer of 16?

1042

Can we extend singleton class in java?

1018

Can two objects have same hashcode?

1051

What is difference between add() and addelement() in vector?

1588

What is update method called?

1211

What is import java util arraylist?

1249

What exactly is methodology?

989

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