RFR: 8315850: Improve AbstractMap anonymous Iterator classes [v2]

[Stuart Marks]

On Thu, 7 Sep 2023 17:23:20 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> This PR proposes to slightly improve some iterators of `AbstractMap`:
>> 
>> * Code reuse
>> * A field declared `final`
>> * Add missing `@Override` annotations
>
> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove @Override annotations

Note, I had asked @minborg to remove the `@Override` annotations. They're generally not used in the collections framework, and where they are, they add a lot of clutter but not much value.

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PR Comment: https://git.openjdk.org/jdk/pull/15615#issuecomment-1710557583