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Re: What Does it Mean to Pass a Generic Class Itself as a Parameter?

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Date	Mon, 10 Oct 2011 09:31:41 -0700
From	Patricia Shanahan <pats@acm.org>
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Subject	Re: What Does it Mean to Pass a Generic Class Itself as a Parameter?
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On 10/10/2011 9:12 AM, markspace wrote:
> On 10/10/2011 8:01 AM, KevinSimonson wrote:
>> Can anyone tell me what's going on here? In {Wierd} itself is the
>> {Wierd} that's being extended in the angle brackets the same {Wierd}
>> that's being defined in this file?
>
>
> Yes. Extension, and polymorphism, just mean "type." Weird is a type of
> Weird, so it fulfills the bound that the type of T must be a type of
> Weird (extends Weird).
>
>
>> And what exactly is happening in
>> {main()} when I declare {wow} to be a {Wierd< Wierd>} object?
>
>
> Well, you didn't do anything with the type parameter T, so not a lot is
> happening. Try to find some existing classes that use type parameters,
> like the Collections classes, and ask that question for them.
>
>

java.lang.Class is also an interesting example. It is declared as
Class<T> where T is the type of the class modeled by the Class object.
Now think about the Class object for java.lang.Class. It is a Class<Class>.

Patricia

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What Does it Mean to Pass a Generic Class Itself as a Parameter? KevinSimonson <kvnsmnsn@hotmail.com> - 2011-10-10 08:01 -0700
  Re: What Does it Mean to Pass a Generic Class Itself as a Parameter? Jeff Higgins <jeff@invalid.invalid> - 2011-10-10 12:11 -0400
    Re: What Does it Mean to Pass a Generic Class Itself as a Parameter? Jeff Higgins <jeff@invalid.invalid> - 2011-10-10 12:56 -0400
  Re: What Does it Mean to Pass a Generic Class Itself as a Parameter? markspace <-@.> - 2011-10-10 09:12 -0700
    Re: What Does it Mean to Pass a Generic Class Itself as a Parameter? Patricia Shanahan <pats@acm.org> - 2011-10-10 09:31 -0700
      Re: What Does it Mean to Pass a Generic Class Itself as a Parameter? Lew <lewbloch@gmail.com> - 2011-10-10 12:12 -0700
        Re: What Does it Mean to Pass a Generic Class Itself as a Parameter? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-10-10 13:32 -0700
          Re: What Does it Mean to Pass a Generic Class Itself as a Parameter? Jeff Higgins <jeff@invalid.invalid> - 2011-10-10 16:40 -0400
          Re: What Does it Mean to Pass a Generic Class Itself as a Parameter? Lew <lewbloch@gmail.com> - 2011-10-10 14:29 -0700
  Re: What Does it Mean to Pass a Generic Class Itself as a Parameter? Screamin Lord Byron <scre@min.dot> - 2011-10-10 19:07 +0200
  Re: What Does it Mean to Pass a Generic Class Itself as a Parameter? Jeff Higgins <jeff@invalid.invalid> - 2011-10-11 02:08 -0400

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