On Tue, 12 Apr 2022 19:55:13 GMT, Eamonn McManus <emcma...@openjdk.org> wrote:
>> PR for Sequenced Collections implementation. > > src/java.base/share/classes/java/util/LinkedHashMap.java line 604: > >> 602: * @return a set view of the keys contained in this map >> 603: */ >> 604: public SequencedSet<K> keySet() { > > Changing the return type means that subclasses of `LinkedHashMap` that > override `keySet()` will no longer compile, unless they also change the > return type. Yes. Previously compiled binaries will also throw `NoSuchMethodError` if they call `super.keySet()`. Clearly these are incompatibilities; the question is whether they are severe enough to warrant pursuing a different approach. If you have any thoughts about how to assess the severity of this change, please let me know. ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/7387#discussion_r848945910