第7周作业1-循环大战

import java.util.Scanner;public class FactorialTest {         public static int run(int n){          if (n == 1) {                 return n;                }else {           return n * run( n - 1 );          }         }    public static void main(String args[]){        System.out.println("请输入需要求阶乘的数字(请输入一个整数):");        Scanner in = new Scanner(System.in);        int a = Integer.parseInt(in.nextLine());        System.out.println(run(a));    }}