mutable fields for objects in a Java Set

Question

Am I correct in assuming that if you have an object that is contained inside a Java Set<> (or as a key in a Map<> for that matter), any fields that are used to determi

Answer 1

That is correct, it can cause some problems locating the map entry. Officially the behavior is undefined, so if you add it to a hashset or as a key in a hashmap, you should not be changing it.