Re: Generic Trouble

From:
Daniel Pitts <newsgroup.spamfilter@virtualinfinity.net>
Newsgroups:
comp.lang.java.programmer
Date:
Sun, 14 Nov 2010 10:52:48 -0800
Message-ID:
<3eWDo.17454$AT2.2616@newsfe01.iad>
On 11/12/2010 4:34 PM, Stefan Ram wrote:

Arne Vajh?j<arne@vajhoej.dk> writes:

Why not use<T> in the interface?


   If this is the recommended way to deal with a ?rawtype?
   warning, when one does not want to restrict the type
   parameter to anything more special than ?java.lang.Object?,
   ok, I will do it.

   I just had read advice before to use ?< ?>? in such cases,
   so I already have edited this into dozens of places. Ok,
   so now I may go back and change it to ?< T>?. I just want
   a general and final solution, so that I will not have to
   change this even more often.


I think maybe you misinterpreted Arne's suggestion, or I did.

I take his suggestion as:

interface MyInterface<T> {
    void addrac(Comparable<T> container, int position);
}

class MyClassForFoo implements MyInterface<Foo> {
    void addrac(Comparable<Foo> container, int position) {}
}

Another alternative, which may work equally well, depending on your
situation, but I doubt it will because of the method signature and lack
of other context in the parameters.

interface MyInterface {
    <T>void addrac(Comparable<T> container, int position);
}

class MyClass implements MyInterface {
    <T> void addrac(Comparable<T> container, int position) {
        T t = container;
    }
}

--
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