Java所得税计算器需要为0或更小的任何数字添加错误消息

import java.util.Scanner;

public class IncomeTaxCalculator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入您的收入: ");
        double income = scanner.nextDouble();

        if (income <= 0) {
            System.out.println("错误：收入必须大于0");
        } else {
            double tax = calculateTax(income);
            System.out.println("应缴纳的税款为: " + tax);
        }
    }

    public static double calculateTax(double income) {
        // 这里假设一个简单的税率表
        if (income <= 50000) {
            return income * 0.1;
        } else {
            return income * 0.2;
        }
    }
}