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 7510

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 11414

What is type casting?

2 4763

What is the java project architecture?

IBM,

1771

What Is Resource Leak?

2 4049

In which language JVM (Java Virtual Machine) is implemented

5 7484

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

1 4601

Can I have constructor in Interface?

2 15595

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

Infosys, Nokia,

1 6894

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

WDC,

3 5472

explain the collection in java

WDC,

1 3833

How to implement Singleton

DELL,

6 7996

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 7471

what is collections in java?

4 5010

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

1 4705

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Un-Answered Questions { Core Java }

Is an empty arraylist null?

585

What are internal variables?

541

Which programming language is best in future?

508

What is the difference between a loader and a compiler?

516

What is the significance of continue jump statement? Explain with an example.

726

does java support pointers?

551

Explain the use of sublass in a java program?

586

How to convert string to byte array and vice versa?

569

hi am an engineering student and my next plan is for ms in either in us or australia i got my passport but i dont know anything bout visa can u give brief idea 1)How to get prepared for visa and 2)How to apply for top universities and 3)How to pay the fee and so on These all are basic questions plz give me a clear idea

1452

Discuss 2D arrays.

592

which one is more efficient int x; 1. if(x==null) 2.if(null==x) state which one either 1 or 2?

9147

What is a for loop in java?

582

What is thread count in java?

534

What is join () in java?

516

Why java does not support pointers?

544

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