递归实现数的阶乘

/**
* @author PLA 阶乘
*/

public static void main(String[] args) {
System.out.println("请输入一个数字：");
Scanner scanner = new Scanner(System.in);
int i = scanner.nextInt();
System.out.println(i + "!=" + fac(i));
}

private static int fac(int i) { // TODO Auto-generated method stub
if (i == 1)
return 1;
else
return i * fac(i - 1);
}