Arrays methods

[Brian Goetz]

> If we added
>
>       <T> void fill(T[], IntFunction<T> gen)
>
> then existing calls to
>
>    fill(array, null)
>
> would become ambiguous.  Doh.  (But the other 17 forms are not
> problematic.)
>
> Any suggestions for alternate names?

Arrays.generate(array, fn)
Arrays.fillApplying(array, fn)
Arrays.initialize(array, fn)
Arrays.setAll(array, fn)

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