code: public static void setRoundingMode (@Nullable final ECurrency eCurrency, @Nullable final RoundingMode eRoundingMode)
    {
      getSettings (eCurrency).setRoundingMode (eRoundingMode);
    }
docs: Change the rounding mode of this currency.
  
  @param eCurrency
  The currency it is about. If <code>null</code> is provided
  {@link #DEFAULT_CURRENCY} is used instead.
  @param eRoundingMode
  The rounding mode to be used. May be <code>null</code>.