Optional.or() doesn't use a wildcard in its signature

Stefan Zobel spliterator at gmail.com
Sat Oct 31 18:21:22 UTC 2015

2015-10-31 19:11 GMT+01:00 Remi Forax <forax at univ-mlv.fr>:

> Hi all, hi Paul,
> I've just seen that Optional.or is declared as
>   public Optional<T> or(Supplier<Optional<T>> supplier) {
> instead of
>   public Optional<T> or(Supplier<? extends Optional<T>> supplier) {
> regards,
> Rémi

I don't get it. Optional is final anyway. Can you explain?


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