code: public void setMinimumSignificantDigits(int min) {
          if (min < 1) {
              min = 1;
          }
          // pin max sig dig to >= min
          int max = Math.max(maxSignificantDigits, min);
          minSignificantDigits = min;
          maxSignificantDigits = max;
          setSignificantDigitsUsed(true);
      }
docs: <strong>[icu]</strong> Sets the minimum number of significant digits that will be displayed. If
  <code>min</code> is less than one then it is set to one. If the maximum significant
  digits count is less than <code>min</code>, then it is set to <code>min</code>.
  This function also enables the use of significant digits by this formatter -
  {@link #areSignificantDigitsUsed()} will return true.
  
  @param min the fewest significant digits to be shown