Java递归实现阶乘

import java.util.Scanner;public class Factorial {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n; while (true) {
System.out.print("请输入一个正整数（输入0退出循环）：");
try {
n = sc.nextInt();
} catch (Exception e) {
System.out.println("错误的类型！");
sc.nextLine();
continue;
}
if (n == 0) {
break;
}
System.out.printf("%d! = %d\n", n, fact(n));
} System.out.println("再见!");
} private static long fact(int n) {
if (n < 0) {
System.out.println("错误的数值范围！");
return -1;
} else {
return factorial(n);
}
} private static long factorial(int n) {
if (n == 1) {
return 1;
} else {
return n * factorial(--n);
}
}
}