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 9184

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 12735

What is type casting?

2 5634

What is the java project architecture?

IBM,

2248

What Is Resource Leak?

2 5502

In which language JVM (Java Virtual Machine) is implemented

5 9227

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

1 5427

Can I have constructor in Interface?

2 17065

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

Infosys, Nokia,

1 7713

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

WDC,

3 6759

explain the collection in java

WDC,

1 4542

How to implement Singleton

DELL,

6 9962

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 8928

what is collections in java?

4 6423

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

1 5380

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Un-Answered Questions { Core Java }

What is return type in java?

1075

How can we use primitive data types as objects?

961

Is singleton thread safe in java?

991

What is the purpose of assert keyword used in jdk1.4.x?

1067

What is int lol?

1142

Why deletion in linkedlist is fast than arraylist?

1104

What is difference between string and new string?

1037

What is tree node in java?

967

what is meant by Garbage collection?

1094

What is data type in java?

908

What is passing parameters in java?

1043

Why multiple inheritance is not supported by java?

985

What is the final keyword in java?

1439

What is difference between static class and normal class?

1121

What do you know about java?

945

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