----- Original Message ----- > From: "Kasper Nielsen" <kaspe...@gmail.com> > To: "Chris Hegarty" <chegar...@gmail.com> > Cc: "core-libs-dev" <core-libs-dev@openjdk.org> > Sent: Friday, March 24, 2023 6:53:51 PM > Subject: Re: The non-deterministic iteration order of Immutable Collections
>> >> I don't (yet) want to be prescriptive in any potential solution. And I >> know that this has been discussed before. I mostly just want to start a >> conversation and see how much traction it gets. >> > Would > java.util.SequencedMap.of(...) > java.util.SequencedMap.copyOf(SequencedMap map) > java.util.SequencedSet.of(...) > java.util.SequencedSet.copyOf(SequencedSet set) > solve your problem? > > I would love to see them included in JEP 431. > Should be fairly simply to implement just have a side > array that maintains the elements in order. I do not think SequenceMap or SequencedSet should be use for copyOf(), Map and Collection should be used instead because the iteration order is enough. This is sadly not something acknowledged by JEP 431, but SequencedSet or SequencedMap are not very useful as interfaces for typing the parameters of public methods. Like NavigableSet/NavigableMap, they can be handy for typing a specific implementation for a field or a local variable but for methods, they are not general enough. > > /Kasper regards, Rémi
