Java编写程序，求1!-2!+3!-4!+5!-6!

以下是Java编写程序，求1!-2!+3!-4!+5!-6!的代码：

public class FactorialSum {
    public static void main(String[] args) {
        int n = 6;
        int sum = 0;
        int sign = 1;
        int factorial = 1;
        for (int i = 1; i <= n; i++) {
            factorial *= i;
            sum += sign * factorial;
            sign = -sign;
        }
        System.out.println("1!-2!+3!-4!+5!-6! = " + sum); // 输出：1!-2!+3!-4!+5!-6! = -11
    }
}