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Re: Generics question
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Re: Generics question


  • Subject: Re: Generics question
  • From: Phillip Hutchings <email@hidden>
  • Date: Fri, 29 May 2009 11:16:14 +1200

On Fri, May 29, 2009 at 11:00, Ricardo J. Parada <email@hidden> wrote:
>
>
> I'm changing my code to use pageWithName(Foo.class) instead of
> pageWithName("Foo") through out the code.
> Then I used to have a method that return the name of the login page which I
> changed to return the class of the login page.  But then if an application
> wants to override that I end up with stuff like this:
>     public Class<MPVLoginPage> loginPageClass() {
>         return PPPLoginPage.class;
>     }
> Here PPPLoginPage is a subclass of MPVLoginPage and I thought this would be
> allowed by java but I'm getting an error and I have not mastered generics
> that well yet.  ;-)
> Is there a better way to do this?

A subclass is not the same type as its superclass. What you probably
want is public Class<? extends MPVLoginPage> loginPageClass() {}

There's a lot more info at
http://java.sun.com/j2se/1.5/pdf/generics-tutorial.pdf


--
Phillip Hutchings
http://www.sitharus.com/
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References: 
 >Generics question (From: "Ricardo J. Parada" <email@hidden>)

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