Why not allow an external interface to provide hashCode/equals for a HashMap?

Question

With a TreeMap it\'s trivial to provide a custom Comparator, thus overriding the semantics provided by Comparable objects added to the

Answer 1

good question, ask josh bloch. i submitted that concept as an RFE in java 7, but it was dropped, i believe the reason was something performance related. i agree, though, should have been done.