22 1+2!+3!+...+5!的和

题目：利用递归方法求5!

   public class _022Recursion5 {

    public static void main(String[] args) {
        long sum = recursion5(5);
        System.out.println("1+2!+3!+...+5!的和:" + "\n" + sum);
    }

    private static long recursion5(int i) {
        if (i == 1) {
            return 1;
        } else {
            return i * recursion5(i - 1);
        }
    }

}