java怎么用递归实现n的阶乘

public class Factorial {    public static int factorial(int n) {        if (n == 0) {            return 1;        } else {            return n * factorial(n - 1);        }    }    public static void main(String[] args) {        int n = 5;        int result = factorial(n);        System.out.println(n + "! = " + result);    }}