On Wed, 27 Mar 2024 17:36:28 GMT, Liam Miller-Cushon <cus...@openjdk.org> wrote:
> This change overrides mutator methods in the implementation returned by > `Map.of().entrySet()` to throw `UnsupportedOperationException`. src/java.base/share/classes/java/util/ImmutableCollections.java line 1323: > 1321: @Override > 1322: public int hashCode() { > 1323: return MapN.this.hashCode(); The hash code for a `Set` is defined as the sum of the elements in the `Set` (hash(`null`) == 0). The `Map. Entry` hash code is defined the same way `MapN.this.hashCode` operates so this seems right. It would be nice with a couple of tests that assert this invariant. ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/18522#discussion_r1615591889