22 1+2!+3!+...+5!的和

题目：利用递归方法求5!

 1    public class _022Recursion5 {
 2 
 3     public static void main(String[] args) {
 4         long sum = recursion5(5);
 5         System.out.println("1+2!+3!+...+5!的和:" + "\n" + sum);
 6     }
 7 
 8     private static long recursion5(int i) {
 9         if (i == 1) {
10             return 1;
11         } else {
12             return i * recursion5(i - 1);
13         }
14     }
15 
16 }