Java利用while循环计算1+1/2!+1/3!……+1/20!

public static void main(String[] args) {
        double n = 1, sum = 0;
        while (n <= 20) {
            sum += 1 / Factorial(n);
            n++;
        }
        System.out.println(sum);

    }

    static double Factorial(double m) {
        if (m == 1 || m == 0) {
            return 1;
        } else {
            return (m * Factorial(m - 1));
        }
    }

public static void main(String[] args) {
        
        double n = 1, j = 1, sum = 0;
        while(n <= 20){
            j = j*n;
            sum += 1/j;
            n++;
        }
        System.out.println(sum);
    }