trivial patch to reduce allocations in nio open* methods

[Brian Burkhalter]

On Mar 30, 2018, at 1:27 AM, Alan Bateman <Alan.Bateman at oracle.com> wrote:

> You can use an immutable set to avoid wrapping the EnumSet, e.g.
>     private static final Set<OpenOption> DEFAULT_CREATE_OPTIONS = Set.of(CREATE_NEW, WRITE);

I was wondering whether the DEFAULT_*_OPTIONS constants should be created at all, i.e., kept around as static finals.

Brian
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