RFR: 8265130: Make ConstantDesc class hierarchy sealed [v3]

[liach]

On Thu, 20 May 2021 22:13:51 GMT, Gavin Bierman <gbierman at openjdk.org> wrote:

>> Hi all,
>> 
>> Please review this patch to make the ConstantDesc hierarchy `sealed`, as was promised in its Javadoc, now that sealed classes are finalising in JDK 17. 
>> 
>> Thanks,
>> Gavin
>
> Gavin Bierman has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Removing file constants.patch added by mistake

src/java.base/share/classes/java/lang/constant/ClassDesc.java line 56:

> 54:  * @since 12
> 55:  */
> 56: sealed public interface ClassDesc

Should move `sealed` behind `public` per the blessed modifier order from JLS. https://docs.oracle.com/javase/specs/jls/se16/preview/specs/sealed-classes-jls.html#jls-8.1.1

Per http://openjdk.java.net/jeps/409 the finalized sealed classes have no difference from that in 16, so the order suggested there should be valid.

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PR: https://git.openjdk.java.net/jdk/pull/4135