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[Doug Lea]

On 12/26/12 11:12, Raab, Donald wrote:
>>       <K> Map<K,<Collection<T>> toMap(Function<? super T,K> keyFn);
>
> This is essentially groupBy.
>

Yeah, and worse, it is the sucky version of groupBy that doesn't
force you to do the right thing and merge while building!
(The overloaded two-arg form does that.)
I'm not even sure it is a service to provide it,
although it is essential here and there and a little
too painful for users to do themselves without the method.

In any case, I think having a highly uniform naming scheme
outweighs most of these concerns.

-Doug