Point lambdaification of List/Set/Map

Stephen Colebourne scolebourne at joda.org
Wed Jun 26 16:47:51 UTC 2013

Sending this on to core-libs-dev to try to get a response ;-)

On 24 June 2013 16:14, Stephen Colebourne <scolebourne at joda.org> wrote:
> One point lambdaification that I haven't seen mentioned is addition
> static factory methods for the main collection interfaces. (Strictly,
> this proposal is not point lambdaification as it does not involve
> lambdas, but it is very much in the same area).
> I propose adding these static methods:
> Collection.empty()
> Collection.of(T...)
> List.empty()
> List.of(T...)
> Set.empty()
> Set.of(T...)
> Map.empty()
> Map.of(Entry...)
> Map.Entry.of(K, V)
> Each of these methods would return immutable implementations.
> There is a case for extending the methods to Iterator and other
> collection types, however these are the most important.
> These follow the designs of Stream static methods IIRC.
> This library change would remove much of the requirement for the
> "collection literals" change discussed in Project Coin.
> Implementation would ideally be via new dedicated immutable classes,
> however space could be saved by simply reusing the existing classes.
> Is this something we could fit in? (Is resourcing the problem, or the idea?)
> thanks
> Stephen

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