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help with Virtual methods!!

Ammar Salem
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Joined: Dec 29, 2007
Posts: 60
Hello again friends,
what are virtual methods?? why do we need them? why, they are called Virtual? does that mean they do not exist? how they are invoked? I know that I have to show some effort people, but , it is not clear enough here in my book, I really could not grasp it at all.I can post my book explaination here but, i know it wouldnt help? I appreciate your help and effort.
Ammar salem


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Daesung Park
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Joined: Mar 22, 2007
Posts: 68
I haven't heard of "virtual" method in Java. Do you mean that of C++, or abstract method of Java?


Daesung Park

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Ammar Salem
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Joined: Dec 29, 2007
Posts: 60
No Daesung Park , it is in my java book. and i dont know what to do with it
regards,
Henry Wong
author
Sheriff

Joined: Sep 28, 2004
Posts: 18825
    
  40

A virtual method (or function) is a distinction that doesn't really exist in Java. In C++, a virtual function is a function/method whose dispatch is determined at runtime -- basically, call the method based on the type of the object, not the type of the reference (pointer).

In Java, (instance) method calls are always dispatched at runtime. In other words, all non-static methods are virtual methods.

Henry


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
Ammar Salem
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Joined: Dec 29, 2007
Posts: 60
thanks to all of you
respect,
Ammar
Ilja Preuss
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Sheriff

Joined: Jul 11, 2001
Posts: 14112
With other words, virtual methods are methods that behave polymorphically. See also http://en.wikipedia.org/wiki/Virtual_function


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Ammar Salem
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Joined: Dec 29, 2007
Posts: 60
thank you ,Ranchers
Ammar Salem
Ranch Hand

Joined: Dec 29, 2007
Posts: 60
thank you,Ranchers
Regards
Ammar
[ January 23, 2008: Message edited by: Ammar Salem ]
 
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