80%时间做非核心的80%工作，写核心的13行代码只能拿基本工资，写200行非核心的代码再拿剩下的部分

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/**
复制代码
 * 报价计算器加档次逻辑：经济800/舒适1200/豪华1800元每 ㎡
 * 把报价计算拆成方法：calcMaterial(area)算材料费=面积×600，calcLabor(area)算人工费=面积×300，main中调用
 * 1、正则表达式
 * 2、main()主方法是static，只能调用static方法，所以其他方法也要是static方法
 * 3、switch -case
 */

import java.util.Scanner;

public class Day22QuoteCalculator {
    private static final double LEVEL_PRICE_ECONOMY = 800;  //  装修经济套餐的单价（元/m²）
    private static final double LEVEL_PRICE_COMFORT = 1200;  //  装修舒适套餐的单价（元/m²）
    private static final double LEVEL_PRICE_LUXURY = 1800;  //  装修豪华套餐的单价（元/m²）
    private static final String LEVEL_DESC_ECONOMY = "经济套餐";  //  经济套餐
    private static final String LEVEL_DESC_COMFORT = "舒适套餐";  //  舒适套餐
    private static final String LEVEL_DESC_LUXURY = "豪华套餐";  //  豪华套餐

    private static final String PRINT_TITLE = "\n------------------------------装修金额（套餐）计算器------------------------------\n";
    private static final String PRINT_LINE = "\n-----------------------------------------------------------------------------\n";
    private static final String PRINT_AREA_TIP = "房屋面积是：%,.2f m²";
    private static final String PRINT_LEVEL_PACKAGE_TIP = "装修套餐是：%s";
    private static final String PRINT_UNIT_PRICE_TIP = "套餐单价是：%,.2f 元/m²";
    private static final String PRINT_AMOUT_TIP = "装修金额是：%,.2f 元";

    private static final String INPUT_AREA_TIP = "请输入房屋面积（m²）,回车确定|exit退出：";
    private static final String INPUT_SELECT_PACKAGE_TIP = "请选择装修套餐（1-经济|2-舒适|3-豪华）:";

    private static final String ERROR_DOUBLE_INPUT_TIP = "输入无效，请重新输入！";
    private static final String ERROR_NON_POSITIVE_TIP = "面积要大于 0 ，请重新输入！";

    private static final String DOUBLE_REGEX = "^[0-9]+(\\.[0-9]+)?$";
    private static final String SELECT_PRICE_REGEX = "^[123]$";

    public static void main(String[] args) {
        Scanner line = new Scanner(System.in);

        while (true) {
            System.out.printf(PRINT_TITLE);
            System.out.print("\n" + INPUT_AREA_TIP);

            String area = line.nextLine();  //  用字符串接收输入
            if (!(area == null || area.isBlank())) {
                if ("exit".equals(area) || "EXIT".equals(area)) {
                    break;
                }
                if (!area.matches(DOUBLE_REGEX)) {
                    System.out.println(ERROR_DOUBLE_INPUT_TIP);     // 非数字/负数/空
                } else {
                    double houseArea = Double.parseDouble(area);
                    if (houseArea <= 0) {
                        System.out.println(ERROR_ONE_INPUT_TIP); //  拦截0
                        continue;
                    }

                    //  提示选择装修套餐
                    System.out.print("\n" + INPUT_SELECT_PACKAGE_TIP);
                    String pkg = line.nextLine();
                    if (!pkg.matches(SELECT_PRICE_REGEX)) {
                        System.out.println(ERROR_NON_POSITIVE_TIP);
                    } else {
                        int level = Integer.parseInt(pkg);
                        double price = switch (level) {
                            case 1 -> LEVEL_PRICE_ECONOMY;
                            case 2 -> LEVEL_PRICE_COMFORT;
                            case 3 -> LEVEL_PRICE_LUXURY;
                            default -> 0;
                        };

                        String desc = switch (level) {
                            case 1 -> LEVEL_DESC_ECONOMY;
                            case 2 -> LEVEL_DESC_COMFORT;
                            case 3 -> LEVEL_DESC_LUXURY;
                            default -> "";
                        };

                        double amount = calcAmount(houseArea, price);
                        System.out.print(PRINT_LINE);
                        System.out.printf(PRINT_AREA_TIP, houseArea);
                        System.out.printf("\n" + PRINT_LEVEL_PACKAGE_TIP, desc);
                        System.out.printf("\n" + PRINT_UNIT_PRICE_TIP, price);
                        System.out.printf("\n" + PRINT_AMOUT_TIP + "\n", amount);
                    }
                }
            }
        }
    }

    static double calcAmount(double area, double price) {
        return area * price;
    }
}