RFR: JDK-8283415: Update java.lang.ref to use sealed classes

Sun Mar 20 17:48:26 UTC 2022

On Sun, 20 Mar 2022 16:28:36 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Another refactoring to use sealed classes where possible, this time in the java.lang.ref package.
>> 
>> Copyright dates will be updated, if needed, before a push.
>
> Marked as reviewed by alanb (Reviewer).

PS @AlanBateman and @kimbarrett , please also review the CSR https://bugs.openjdk.java.net/browse/JDK-8283428
Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/7874