1!+2!+...n!求和程序

public class JcDemo{            public static int func(int n){         if(n>1)         return n*func(n-1);         else          return 1;}       public static void main(String[] args){             int n = Integer.parseInt(args[0]);             if(n>0)             {             int sum = 0;             for(;n>0;n--)             sum = sum + func(n);             System.out.println("输入正整数的阶乘的和是 ："+sum);             }             else             System.out.println("请输出正整数");}}