java计算薪水问题求助

 public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (true) {
            try {
                int guessNumber = sc.nextInt();
                if (guessNumber > 8000) {
                    int num1 = guessNumber - 8000;
                    int num2 = 8000 - 5000;
                    int num3 = 5000 - 3500;
                    System.out.println(num1 * 0.2 + num2 * 0.1 + num3 * 0.03);
                } else if (guessNumber < 8000 && guessNumber > 5000) {
                    int num1 = guessNumber - 5000;
                    int num2 = 5000 - 3500;
                    System.out.println(num1 * 0.1 + num2 * 0.3);
                } else if (guessNumber < 5000 && guessNumber > 3500) {
                    System.out.println((guessNumber - 3500) * 0.03);
                } else {
                    System.out.println("不交税");
                }
            } catch (InputMismatchException e) {
                System.out.println("输入金额有误");
            }
        }
    }