Optional should really be a closed type, as it's basically an
algebraic datatype, something like:
abstract class Option<T> {
private Option() { }
static final class None<T> extends Option<T> { }
static final class Some<T> extends Option<T> { ... }
}
I would not expect it to be something you can subtype as a third party.
On Fri, Oct 26, 2012 at 1:18 PM, clay <[email protected]> wrote:
> Using the latest lambda build, I just tried to write:
>
> public class FixedOptional<T> extends Optional<T> implements Iterable
>
> which may be arguably better than using one of the many existing excellent
> independent implementations (Functional Java, Atlassian).
>
> Unfortunately the none/empty constructor is private so I can't create a
> derived version.
>
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