public class TestRecursion {

public static void main(String[] args) {
    int i;
    System.out.println("请输入需要阶乘的一个整数:");
    Scanner scanner = new Scanner(System.in);
    i = scanner.nextInt();
    System.out.println(i + "的阶乘是：" + jc(i));

}

public static int jc(int i) {
    if (i == 0 && i == 1) {
        return 1;
    } else if (i > 0) {

        int result = i * jc(i - 1);
        return result;
    } else {
        return 1;
    }

}

}