递归的打印和阶乘运用

public class Recursion01{
    public static void main(String[] args){
            T t1 = new T();
            t1.test(4);//输出什么？ n=2 n=3 n=4
            int res = t1.factorial(5);
            System.out.println("5 的阶乘 res =" + res);


    }
}

class T{
    //分析
    public void test(int n){
        if(n > 2){
            test(n-1);
        }
        System.out.println("n =" + n);
    }
    //factorial 阶乘
    public int factorial(int n){
        if(n == 1){
            return 1;
        }else{
            return factorial(n-1) * n;
        } 
    }
}