报价菜单循环版

② 的核心机制全对：外层 do-while（面积层）+ 内层 while（档次层），"0-返回上一步"跳出内层回面积、"报完价 break"回外层顶部——"返回菜单"的循环语义。没用 Ctrl+C 结束思维，完整走通了 菜单→功能→回菜单 的闭环。

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/**
复制代码
 * ②报价菜单循环版：菜单→进入功能→返回菜单
 * <p>
 * 注意：
 * 1、switch-case语句
 * 2、边界判断
 * 3、退出机制
 * 4、常量
 * 5、数组
 *
 */

import java.util.Scanner;

public class Day13QuoteMenu {
    public static final String[] MENU = {"1 - 经济型装修", "2 - 舒适型装修", "3 - 豪华型装修", "0 - 退出"};
    public static final double LEVEL_PRICE_ECONOMY = 800d;
    public static final double LEVEL_PRICE_COMFORT = 1200d;
    public static final double LEVEL_PRICE_LUXURY = 1800d;

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

        do {
            System.out.println("----------报价菜单循环版----------");
            for (String menu : MENU) {
                System.out.println(menu);
            }
            System.out.print("请输入房屋面积（m²）【0-退出】：");
            double houseAreaIn = in.nextDouble();
            if (houseAreaIn < 0) {
                System.out.println("请输入有效的房屋面积！");
                continue;
            }else {
                if (houseAreaIn == 0) {
                    System.out.println("您选择的是：" + MENU[MENU.length-1]);
                    break;
                }
                while(true) {
                    System.out.print("请选择装修档次(1经济|2舒适|3豪华)的数字【0-返回上一步】：");
                    int renovationLevelIn = in.nextInt();
                    if (renovationLevelIn == 0) {
                        break;
                    }else {
                        if (renovationLevelIn >= 1 && renovationLevelIn <= 3) {
                            double renovationUnitPrice = switch (renovationLevelIn) {
                                case 1 -> LEVEL_PRICE_ECONOMY;
                                case 2 -> LEVEL_PRICE_COMFORT;
                                case 3 -> LEVEL_PRICE_LUXURY;
                                default -> 0.0;
                            };
                            System.out.printf("您选择的装修档次是：%s%n", MENU[renovationLevelIn-1]);
                            System.out.printf("装修总价是：%,.2f 元，其中房屋面积是：%,.2f m²，装修单价是：%,.2f 元%n",(renovationUnitPrice * houseAreaIn),houseAreaIn,renovationUnitPrice);
                            break;
                        }
                    }
                }
            }
        }while(true);
    }
}