輸入奇數- X形狀

    public static void main(String[] args) {

        Scanner sca = new Scanner(System.in);
        System.out.print("請輸入一奇數：");
        int    num = sca.nextInt();
        showX(num);
    }

    public static void showX(int hight) {

        if (hight % 2 == 0) {
            System.out.println("輸入不為奇數");
            return;
        } else {
            int mid = hight / 2 + 1;

            for (int i = 1; i < mid; i++) {
                for (int x = 1; x < i; x++)
                    System.out.print(" ");
                System.out.print("X");
                for (int y = 1; y <= hight - i * 2; y++)
                    System.out.print(" ");
                System.out.println("X");
            }
            for (int x = 1; x < mid; x++)
                System.out.print(" ");
            System.out.println("X");

            for (int i = 1; i < mid; i++) {
                for (int x = 1; x < mid - i; x++)
                    System.out.print(" ");
                System.out.print("X");
                for (int y = 1; y < i * 2; y++)
                    System.out.print(" ");
                System.out.println("X");
            }

        }

    }