RFR: 8283700: Add final or sealed modifier to appropriate java.awt API classes

[Joe Darcy]

On Mon, 28 Mar 2022 16:30:50 GMT, Phil Race <prr at openjdk.org> wrote:

> JDK 17 delivered JEP 409: Sealed Classes : https://openjdk.java.net/jeps/409
> In essence this JEP allows a class to limit which classes can subclass it.
> If a class has no subclasses and cannot be subclassed outside the JDK it can also be made final.
> Suitable classes across the JDK are being retro-fitted to be sealed (or made final) where it can be done compatibly.
> This fix takes care of several AWT classes which were identified.
> If later we need to remove sealed or make a class non-final that will also be a compatible change,
> so we aren't locking ourselves into this.
> 
> All our automated regression tests - plus JCK tests have been run.
> 
> This will require a CSR

Marked as reviewed by darcy (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/7998