RFR: 8265130: Make ConstantDesc class hierarchy sealed [v2]

[Gavin Bierman]

On Thu, 20 May 2021 21:32:08 GMT, Mandy Chung <mchung at openjdk.org> wrote:

>> Gavin Bierman has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Removing javadoc comments about future use of sealed
>
> src/java.base/share/classes/java/lang/constant/DynamicConstantDesc.java line 59:
> 
>> 57:  * @since 12
>> 58:  */
>> 59: non-sealed public abstract class DynamicConstantDesc<T>
> 
> can you explain why `DynamicConstantDesc` is non-sealed?

It's a permitted subclass of ConstantDesc, so it must be either `final`, `sealed`, or `non-sealed`. Making it `non-sealed` means it can still be extended.

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