code: public void printAscii(final StringBuilder out) {
      for (int i = 0; i < buckets.length; i++) {
        printAsciiBucket(out, i);
      }
    }
docs: Prints this histogram in a human readable ASCII format.
  <p>
  This is equivalent to calling {@link #printAsciiBucket} on every
  bucket.
  @param out The buffer to which to write the output.