code: public void setMinimumFractionDigits(int newValue) {
          minimumFractionDigits = Math.max(0,newValue);
          if (maximumFractionDigits < minimumFractionDigits)
              maximumFractionDigits = minimumFractionDigits;
      }
docs: Sets the minimum number of digits allowed in the fraction portion of a
  number.  This must be &lt;= maximumFractionDigits.  If the
  new value for minimumFractionDigits exceeds the current value
  of maximumFractionDigits, then maximumFractionDigits will also be set to
  the new value.
  @param newValue the minimum number of fraction digits to be shown; if
  less than zero, then zero is used.  Subclasses might enforce an
  upper limit to this value appropriate to the numeric type being formatted.
  @see #getMinimumFractionDigits