我做了以下事情

MathContext context = new MathContext(7, RoundingMode.HALF_UP);

BigDecimal roundedValue = new BigDecimal(value, context);

// Limit decimal places

try {

roundedValue = roundedValue.setScale(decimalPlaces, RoundingMode.HALF_UP);

} catch (NegativeArraySizeException e) {

throw new IllegalArgumentException("Invalid count of decimal places.");

}

roundedValue = roundedValue.stripTrailingZeros();

String returnValue = roundedValue.toPlainString();

如果輸入現(xiàn)在為“-0.000987654321”(=值),我返回“-0.001”(=返回值)即可.

如果輸入現(xiàn)在為“-0.0000987654321”,我會返回“-0.0001”,這也沒關(guān)系.

但是當(dāng)輸入現(xiàn)在是“-0.00000987654321”時,我得到“0.0000”而不是“0”,這是不行的.這有什么不對？為什么在這種情況下不刪除尾隨零？