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Why declare HttpServlet class abstract?
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Alton Hernandez
Ranch Hand
Joined: May 30, 2003
Posts: 443
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What is the reason for declaring HttpServlet class abstract? There doesn't seems to be any abstract methods.
Thanks.
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Mikalai Zaikin
Ranch Hand
Joined: Jun 04, 2002
Posts: 3099
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Hi.
Because this class is not supposed to be created by user, only Servlet Container can create instances of servlet (it does not make much sense to have servlet object outside servlet container).
And every vendor has it's proprietary implementation of concrete servlet class, which is created inside servlet container.
Cheers !
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Leandro Oliveira
Ranch Hand
Joined: Nov 07, 2002
Posts: 298
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supose you have three classes:
Car, FordFocus,FordF250
suppose you have three guys: A,B, C, each one can have a car:
A.setCar(new FordFocus());
b.setCar(new FordF250());
c.setCar(new Car());//this has no usefull meaning
The point is, Car is so abstract that we can't create cars of this class... The same aplies to HttpServlet, Servlet, GenericServlet... If we could create HttpServlets by just calling one constructor they wouldn't be usefull. Each Servlet MUST be implemented.
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subject: Why declare HttpServlet class abstract?
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