Interview Questions

Q:

What do you understand by private, protected and public?

Answer

These are accessibility modifiers. Private is the most restrictive, while public is the least restrictive. There is no real difference between protected and the default type (also known as package protected) within the context of the same package, however the protected keyword allows visibility to a derived class in a different package.

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Subject: Java

0 1976
Q:

How to assign address to the reference?

Answer

ClassName refName = new ClassName();


or


ClassName refName;


refName = new ClassName();

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Subject: Java

0 1975
Q:

What is the difference between start_form and open_form in scripts? Why is it necessary to close a form always once it is opened?

Answer

strat_form using this we can open many layoutses
open_form using this we can open the layout
performance will be high

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Subject: ABAP

0 1975
Q:

What is the difference between an Interface and an Abstract class?

Answer

An abstract class can have instance methods that implement a default behavior. An Interface can only declare constants and instance methods, but cannot implement default behavior and all methods are implicitly abstract. An interface has all public members and no implementation. An abstract class is a class which may have the usual flavors of class members (private, protected, etc.), but has some abstract methods.

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Subject: Java

0 1975
Q:

What are windows object and navigator object in JavaScript?

Answer

Windows object is top level object in Java script. It contains several other objects such as, document, history, location, name, menu bar etc., in itself. Window object is the global object for Java script that is written at client-side.


Information pertaining to the client browser and system is returned by the navigator object of JavaScript. Navigator object is the top level object for all users.

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Subject: Web Technology

0 1974
Q:

How E-commerce works?

Answer

=> When a consumer wants to buy a certain product, he go to the website and selects the product he wants to buy. 


=> Once the product is selected, the consumer transaction is moved to the online transaction server where he places an order. 


=> The informations is exchanged over a secure channel through a private gateway to a processing network. 


=> The networked banks accept or reject the transaction.


 All this happens in just a matter of seconds. E-commerce is a very secure due to the SSL (Secure Socket Layer) technology.

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Subject: Web Technology

0 1973
Q:

What is Web Browser ?

Answer

Web browser is a software application used to locate,retrieve and display content on the World Wide Web, including Web pages, images, videos and other files.


Examples : Microsoft Internet Expiorer , Mozilla Firefox , Google Chrome, Opers , Safari etc...

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Subject: Web Technology

0 1972
Q:

What are the 3main tasks of JVM?

Answer

The JVM performs three main tasks:


• Loads code


• Verifies code


• Executes code

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Subject: Java

0 1969