Internet: Virtual Methods & Polymorphism in C#

Virtual Methods & Polymorphism in C#

Written by Pawan Bangar

Virtual methods allow object oriented languages to express polymorphism.This means that a derived class can write a method with repparttar

same signature as a methd in its base class, and repparttar 118599

bas class will call repparttar 118600

derived class's method.By default in java, all methods are virtual.

In C# like c++, repparttar 118601 virtual keyword is needed to specify that a method should override a method (or implementaion an abstract method) of its base class.

Class B { public virtual void foo () {}

} ClassD : B { public override void foo () {} }

Attemting to override a non-virtual method will results in a compile-time error unless repparttar 118602 "new" keyword is added to repparttar 118603 declaration, indicating repparttar 118604 method is intentionally hiding repparttar 118605 base clas's method.

Class N : D { public new void foo () {} } N n = new N ();n.foo; // calls N's foo ((D)n).foo; // calls D's foo ((B)n).foo(); //calls D's foo

Introducing A9.com

Written by Jakob Jelling

By Jakob Jelling http://www.sitetube.com

In this age of keeping repparttar search engine capabilities clean and providing a less is more approach, Google.com has emerged from virtually out of nowhere to be repparttar 118598 leading engine available. People like Google because they aren’t barraged with useless information, flashy banner ads and most of all, annoying pop-up advertisements. People want to get their information fast and without being inundated about repparttar 118599 newest car or fad diet. Enter a new player into this domain A9.com.

A9.com was formed and opened in Palo Alto California in October 2003. Branded as a subsidiary of Amazon.com, Inc., A9.com is looking to take over where Google left off. You may be wondering what makes A9.com any better than Google? The answer is that A9.com offers users search results from five separate repositories. Google.com provides repparttar 118600 web and image section and book texts are offered by none other than Amazon.com. Vast libraries of over 120,000 books on repparttar 118601 market today are at repparttar 118602 users fingertips should they need references. Movie and theatre references are drawn from IMDB.com otherwise known as Internet Movie Database. Gurunet.com provides reference information to this site as well.

What makes A9 interesting is that it captures or snapshots previous searches into memory. As repparttar 118603 user searches repparttar 118604 web abroad they will continue to build their own history file in case they need to research repparttar 118605 information again in repparttar 118606 future. A9.com also provides a detailed diary that you can maintain. If you think that Google still may have a stronger hold because of its toolbar capabilities, think again, A9.com has its own toolbar as well. By using repparttar 118607 A9.com toolbar, users can retrieve information previously searched quickly and more efficiently.

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