RFR: 8297519: Improve expressions and modernise code [v3]

[Roger Riggs]

On Wed, 30 Nov 2022 08:03:50 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> During the work of another PR (https://github.com/openjdk/jdk/pull/11260), several improvement areas were identified. These are now adressed in this separate PR proposing the use of more modern Java constructs as well as simplifying a large number of logical expressions that were previously non-normative. 
>> 
>> 
>> This branch has been tested and passed tier1-4 tests.
>
> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove switch and use pattern matching

A suggestion on the bug title, include "PKCS" or something to identity what code is being modernized.

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PR: https://git.openjdk.org/jdk/pull/11348