<div dir="ltr">I agree with the point made in the FAQ about the popularity of such problems. That said, I don't think that it is that unpopular to be ignored.<div><br></div><div>Regarding Map.values(), this is the case, but, In my experience, one of the main advantages of using TreeMultiset was O(long n) modification complexity. Collection views returned by map, for obvious reasons, forbid modification. Also, correct me if I`m wrong, but while TreeMultiset is an unpopular requirement, it is at least as popular as TreeSet.</div><div><br></div><div>Also, I may not have a full view of how such Bag collections can be implemented and used, however, I feel like there could be more to it.</div><div><br></div><div>I am not insisting on anything, I just feel that if there is someone (like me lol) who is willing to take on full development and integration cycle, there aren't much reason to reject such enhancements.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">сб, 20 апр. 2024 г. в 23:43, ІП-24 Олександр Ротань <<a href="mailto:rotan.olexandr@gmail.com">rotan.olexandr@gmail.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">I agree with the point made in the FAQ about the popularity of such problems. That said, I don't think that it is that unpopular to be ignored.<div><br></div><div>Regarding Map.values(), this is the case, but, In my experience, one of the main advantages of using TreeMultiset was O(long n) modification complexity. Collection views returned by map, for obvious reasons, forbid modification. Also, correct me if I`m wrong, but while TreeMultiset is an unpopular requirement, it is at least as popular as TreeSet.</div><div><br></div><div>Also, I may not have a full view of how such Bag collections can be implemented and used, however, I feel like there could be more to it.</div><div><br></div><div>I am not insisting on anything, I just feel that if there is someone (like me lol) who is willing to take on full development and integration cycle, there aren't much reason to reject such enhancements.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">сб, 20 апр. 2024 г. в 23:31, David Alayachew <<a href="mailto:davidalayachew@gmail.com" target="_blank">davidalayachew@gmail.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:monospace">Your Bag suggestion has been asked so frequently that there is an FAQ entry in the official Java Docs.</div><div class="gmail_default" style="font-family:monospace"><br></div><div class="gmail_default" style="font-family:monospace"><a href="https://docs.oracle.com/en/java/javase/22/docs/api/java.base/java/util/doc-files/coll-designfaq.html#a3" target="_blank">https://docs.oracle.com/en/java/javase/22/docs/api/java.base/java/util/doc-files/coll-designfaq.html#a3</a></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Apr 20, 2024 at 4:25 PM ІП-24 Олександр Ротань <<a href="mailto:rotan.olexandr@gmail.com" target="_blank">rotan.olexandr@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">In this letter I would like to express some of my thoughts regarding the potential Multiset interface.<div><br></div><div>I, personally, have encountered a few situations where such an interface could come in handy, mostly when I needed an ordered collection that permits duplicates. That time I used guava`s TreeMultiset, but I think Java itself should have such a collection in its std library. While it is not a very common problem, there are still a bunch of use cases where such things could come in handy.</div><div><br></div><div>I am willing to take on development of such thing, but there are a few concerns about Multiset: </div><div><br></div><div>1. Is there any other use for this besides ordered collection that permits duplicates? I can't remember anything else from the top of my head.</div><div><br></div><div>2. Guava's TreeMultiset class hierarchy pretty much imitates TreeSet class hierarchy, while not being directly connected. I think introducing any other ordered collection will require some refactoring of existing collection interfaces (for example extract SortedCollection from SortedSet, Navigable Collection from NavigableSet etc.). From the perspective of clean code, this would be the right decision, but I feel like this will be a very complex task to accomplish.</div><div><br></div><div>3. Maybe there should be few versions of Tree collection (for example, for regular tasks red-black tree and B-Tree for large amounts of data). I have some expirience implementing both, but is it really needed in standard library?</div></div>
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