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");
}
}