使用BigDecimal轉換較長小數時候出現科學計數法的問題

    public static String divToString(double v1, double v2, int scale){
        if (scale < 0) {
            throw new IllegalArgumentException(
                    "The scale must be a positive integer or zero");
        }
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));
        return  b1.divide(b2, scale, BigDecimal.ROUND_HALF_UP).toString();
    }

只要將BigDecimal 對象toString()就好。