toArray

[Remi Forax]

On 12/16/2012 01:08 AM, Brian Goetz wrote:
> Seems that the minimally invasive version of toArray (that doesn't 
> propagate the horrible convention established by Collection, and yet 
> doesn't foist Object[] on users) is:
>
>   interface Stream<T> {
>       Object[] toArray();
>       T[] toArray(Class<T> clazz);
>   }
>
> It is unfortunate to need the Object[] version at all.  However, code 
> that is generic in T might be passed a Stream<T> and not know what 
> class literal to use.  It is further unfortunate that we cannot say
>
>   <S super T> S[] toArray(Class<S> clazz)
>
> as then such code could say toArray(Object.class), but we cannot (this 
> is a limitation of generics.)
>

why not ?

interface Stream<T> {
       <U> U[] toArray(Class<U> clazz);
}

Rémi