JAVA 除法 double

/**
 * double除法
 *
 * @param a
 * @param b
 * @param accurate 結果保留位數
 * @return
 */
public static double division(double a, double b, int accurate) {
    if (accurate < 0) {
        throw new RuntimeException("精確度必須是正整數或零");
    }
    BigDecimal b1 = new BigDecimal(a);
    BigDecimal b2 = new BigDecimal(b);
    return b1.divide(b2, accurate, BigDecimal.ROUND_HALF_UP).doubleValue();
}