RFR: JDK-8147460: Clean-up jrtfs implementation

[Alan Bateman]

On 14/04/2016 09:53, Paul Sandoz wrote:
> Hi Sherman,
>
> Not a full review, I browsed the code very quickly and noticed one thing:
>
> JrtFileSystem
> —
>
>   167     private static final Set<String> supportedFileAttributeViews
>   168             = Collections.unmodifiableSet(
>   169                     new HashSet<String>(Arrays.asList("basic", "jrt")));
>
> Use Set.of.
One constraint that Sherman didn't mention is that jrtfs is compiled to 
JDK N-1, currently JDK 8, so that tools/IDEs can run on JDK 8 and access 
the classes/resources in a target JDK 9 runtime image. I thought we put 
a comment at the top of each source file on this but I need to check. It 
will be caught by the build anyway.

-Alan.