RFR (S) 8136500: Integer/Long getChars and stringSize should be more idiomatic

[John Rose]

On Nov 23, 2015, at 8:23 AM, Ivan Gerasimov <ivan.gerasimov at oracle.com> wrote:
> 
> Though, it may be better to get yet another pair of eyes.
> 
> One minor nit: In the tests, in the summary, it is written, "Test Integer.toString method*s*", but only one of the overloads is tested.

Here's another nit in the tests.
This is supposed to "wiggle around" critical points, which I agree with.
But it only wiggles above:

  39         while (base < Long.MAX_VALUE / 10) {
  40             for (int c = 1; c < 65536; c++) {
  41                 buildAndTest(base + c);
  42             }
  43             base = (base == 0) ? 1 : base * 10;
  44         }

I suggest:  for (int c = -1<<15; c <= 1<<15; c++)

You'll need to guard the call to buildAndTest to avoid negatives.
You could also start base at, say, 10000.

— John