<吃货联盟订餐系统>---->项目案例

package cn.happy;

import java.util.Scanner;

public class OrderingMgr {
    /**
     * 《吃货联盟订餐系统》
     * 
     * @author 逍遥菠菜 T14班-王清波-24
     */
    public static void main(String[] args) {
        // 首先导入Scanner 控制台输入
        Scanner input = new Scanner(System.in);
        // 声明订单信息
        String[] names = new String[4];// 保存订单人姓名
        String[] dishMegs = new String[4];// 保存所选信息，包括菜品名及份数
        int[] times = new int[4];// 保存送餐时间
        String[] addresses = new String[4];// 保存送餐地址
        int[] states = new int[4];// 保存订单状态：0表示已预订，1表示已完成
        double[] sumPrices = new double[4];// 保存订单总金额
        // 第一条订单信息
        names[0] = "张晴";
        dishMegs[0] = "红烧带鱼 2份";
        times[0] = 12;
        addresses[0] = "天成路 207号";
        sumPrices[0] = 76.0;
        states[0] = 1;
        // 第二条订单信息
        names[1] = "张晴";
        dishMegs[1] = "鱼香肉丝 2份";
        times[1] = 18;
        addresses[1] = "天成路 207号";
        sumPrices[1] = 45.0;
        states[1] = 0;
        // 菜品信息
        String[] dishNames = { "红烧带鱼", "鱼香肉丝", "时令蔬菜" };// 菜品名称
        double[] prices = new double[] { 38.0, 20.0, 10.0 };// 菜品价格
        int[] praiseNums = new int[3];// 点赞数
        int num = -1;// 用户输入0返回主菜单，否则退出系统
        boolean flag = false;// 记录用户是否退出系统，true为退出
        System.out.println("欢迎使用“吃货联盟订餐系统”");
        // 进入循环
        do {
            // 菜单
            System.out.println("*******************************");
            System.out.println("1、我要订餐");
            System.out.println("2、查看餐袋");
            System.out.println("3、签收订单");
            System.out.println("4、删除订单");
            System.out.println("5、我要点赞");
            System.out.println("6、退出系统");
            System.out.println("*******************************");
            System.out.print("请选择：");
            int choose = input.nextInt();// 输入编号
            switch (choose) {
            case 1:// 我要点餐
                System.out.println("****我要订餐****");
                boolean isAdd = false;
                for (int i = 0; i < names.length; i++) {
                    if (names[i] == null) {// 找到元素空位
                        isAdd = true;// 可以订餐
                        System.out.print("请输入订餐人姓名：");
                        String name = input.next();
                        // 菜品信息
                        System.out.println("序号" + "	" + "菜名" + "	" + "单价");
                        for (int j = 0; j < dishNames.length; j++) {
                            String price = prices[j] + "元";
                            String praiseNum = (praiseNums[j] > 0) ? praiseNums[j]
                                    + "赞"
                                    : "0";
                            System.out.println((j + 1) + "	" + dishNames[j]
                                    + " 	" + price);
                        }
                        // 点菜
                        System.out.print("请您选择要点的菜品编号：");
                        int chooseDish = input.nextInt();
                        System.out.print("请选择您需要的份数：");
                        int number = input.nextInt();
                        String dishMeg = dishNames[chooseDish - 1] + " "
                                + number + "份";
                        double sumPrice = prices[chooseDish - 1] * number;
                        double deliCharge = (sumPrice >= 50) ? 0 : 5;// 满50免送餐费
                        System.out.print("请输入送餐时间(送餐时间是10点至20点间整点送餐)：");
                        int time = input.nextInt();
                        while (time < 10 || time > 20) {
                            System.out.print("您输入的时间有误，请输入10~20间的整数！");
                            time = input.nextInt();
                        }
                        // 订单信息
                        System.out.print("请输入送餐地址：");
                        String address = input.next();
                        System.out.println("订餐成功！");
                        System.out.println("您订的是：" + dishMeg);
                        System.out.println("送餐时间是：" + time + "点");
                        System.out.println("餐费" + sumPrice + "元,送餐费"
                                + deliCharge + "元，总计："
                                + (sumPrice + deliCharge) + "元");
                        names[i] = name;
                        dishMegs[i] = dishMeg;
                        times[i] = time;
                        addresses[i] = address;
                        sumPrices[i] = sumPrice + deliCharge;
                        break;
                    }
                }
                if (!isAdd) {
                    System.out.println("对不起，您的餐袋已满！");
                }
                break;
            case 2:// 查看餐袋
                System.out.println("****查看餐袋****");
                System.out.println("序号	订餐人	餐品信息		送餐日期"
                        + "	送餐地址		总金额	订单状态");
                for (int i = 0; i < names.length; i++) {
                    if (names[i] != null) {
                        String state = (states[i] == 0) ? "已预订" : "已完成";
                        String date = times[i] + "日";
                        String sumPrice = sumPrices[i] + "元";
                        System.out.println((i + 1) + "	" + names[i] + "	"
                                + dishMegs[i] + "	" + date + "	"
                                + addresses[i] + "	" + sumPrice + " 	"
                                + state);
                    }
                }
                break;
            case 3:// 签收订单
                System.out.println("****签收订单****");
                boolean isSignFind = false;// 找到要签收的订单
                System.out.print("请选择要签收的订单序号：");
                int choose1 = input.nextInt();
                for (int i = 0; i < names.length; i++) {
                    if (names[i] != null && states[i] == 0 && choose1 == i + 1) {
                        // 状态为已预订，序号为用户输入的订单序号减1,可签收。
                        // 状态为已完成，序号为用户输入的订单序号减1，不可签收。
                        states[i] = 1;// 将状态值置为已完成
                        System.out.println("订单签收成功！");
                        isSignFind = true;// 已找到此订单
                    } else if (names[i] != null && states[i] == 1
                            && choose1 == i + 1) {
                        System.out.println("您选择的订单已完成签收，不能再次签收！");
                        isSignFind = true;// 已找到此订单
                    }
                }
                if (!isSignFind) {
                    System.out.println("您选择的订单不存在！");// 未找到订单
                }
                break;
            case 4:// 删除订单
                System.out.println("****签收订单****");
                boolean isdelFind = false;// 是否删除找到的订单
                System.out.print("请输入要删除的订单序号：");
                int choose2 = input.nextInt();
                for (int i = 0; i < names.length; i++) {
                    // 状态为已预订，序号为用户输入的订单序号减1,可删除。
                    // 状态为已完成，序号为用户输入的订单序号减1，不可删除。
                    if (names[i] != null && states[i] == 1 && choose2 == i + 1) {
                        isdelFind = true;// 已找到订单
                        // 删除操作，删除后的元素依次后移
                        for (int j = choose2 - 1; j < names.length - 1; j++) {
                            names[j] = names[j + 1];
                            dishMegs[j] = dishMegs[j + 1];
                            times[j] = times[j + 1];
                            addresses[j] = addresses[j + 1];
                            states[j] = states[j + 1];
                            sumPrices[j] = sumPrices[j + 1];
                        }
                        // 最后一位清空
                        int endindex = names.length - 1;
                        names[endindex] = null;
                        dishMegs[endindex] = null;
                        times[endindex] = 0;
                        addresses[endindex] = null;
                        states[endindex] = 0;
                        sumPrices[endindex] = 0;
                        System.out.println("删除订单成功！");
                        break;
                    } else if (names[i] != null && states[i] == 0
                            && choose2 == i + 1) {
                        System.out.println("您选择的订单未签收，不能删除！");
                        isdelFind = true;// 已找到订单
                    }
                }
                if (!isdelFind) {
                    System.out.println("您要删除的订单不存在！");
                }

                break;
            case 5:// 我要点赞
                System.out.println("****我要点赞****");
                // 展示菜品信息
                System.out.println("序号" + "	" + "菜名" + "	" + "单价");
                for (int i = 0; i < dishNames.length; i++) {
                    String price = prices[i] + "元";
                    String praiseNum = (praiseNums[i] > 0) ? praiseNums[i]
                            + "赞" : "0";
                    System.out.println((i + 1) + "	" + dishNames[i] + "	"
                            + price + "	" + praiseNum);
                }
                System.out.print("请选择您要点赞的菜品序号：");
                int choose3 = input.nextInt();
                praiseNums[choose3 - 1]++;
                System.out.println("点赞成功！");
                break;
            case 6:// 退出系统
                flag = true;
                break;
            default:
                // 退出系统
                flag = true;
                break;
            }
            if (!flag) {
                System.out.print("输入0返回！");
                num = input.nextInt();
            } else {
                break;
            }
        } while (num == 0);
        System.out.println("谢谢使用。欢迎下次光临！");
    }

}