<吃貨聯盟訂餐系統>---->項目案例

package cn.happy;

import java.util.Scanner;

public class OrderingMgr {
    /**
     * 《吃貨聯盟訂餐系統》
     * 
     * @author 逍遙菠菜 T14班-王清波-24
     */
    public static void main(String[] args) {
        // 首先導入Scanner 控制台輸入
        Scanner input = new Scanner(System.in);
        // 聲明訂單信息
        String[] names = new String[4];// 保存訂單人姓名
        String[] dishMegs = new String[4];// 保存所選信息，包括菜品名及份數
        int[] times = new int[4];// 保存送餐時間
        String[] addresses = new String[4];// 保存送餐地址
        int[] states = new int[4];// 保存訂單狀態：0表示已預訂，1表示已完成
        double[] sumPrices = new double[4];// 保存訂單總金額
        // 第一條訂單信息
        names[0] = "張晴";
        dishMegs[0] = "紅燒帶魚 2份";
        times[0] = 12;
        addresses[0] = "天成路 207號";
        sumPrices[0] = 76.0;
        states[0] = 1;
        // 第二條訂單信息
        names[1] = "張晴";
        dishMegs[1] = "魚香肉絲 2份";
        times[1] = 18;
        addresses[1] = "天成路 207號";
        sumPrices[1] = 45.0;
        states[1] = 0;
        // 菜品信息
        String[] dishNames = { "紅燒帶魚", "魚香肉絲", "時令蔬菜" };// 菜品名稱
        double[] prices = new double[] { 38.0, 20.0, 10.0 };// 菜品價格
        int[] praiseNums = new int[3];// 點贊數
        int num = -1;// 用戶輸入0返回主菜單，否則退出系統
        boolean flag = false;// 記錄用戶是否退出系統，true為退出
        System.out.println("歡迎使用“吃貨聯盟訂餐系統”");
        // 進入循環
        do {
            // 菜單
            System.out.println("*******************************");
            System.out.println("1、我要訂餐");
            System.out.println("2、查看餐袋");
            System.out.println("3、簽收訂單");
            System.out.println("4、刪除訂單");
            System.out.println("5、我要點贊");
            System.out.println("6、退出系統");
            System.out.println("*******************************");
            System.out.print("請選擇：");
            int choose = input.nextInt();// 輸入編號
            switch (choose) {
            case 1:// 我要點餐
                System.out.println("****我要訂餐****");
                boolean isAdd = false;
                for (int i = 0; i < names.length; i++) {
                    if (names[i] == null) {// 找到元素空位
                        isAdd = true;// 可以訂餐
                        System.out.print("請輸入訂餐人姓名：");
                        String name = input.next();
                        // 菜品信息
                        System.out.println("序號" + "\t" + "菜名" + "\t" + "單價");
                        for (int j = 0; j < dishNames.length; j++) {
                            String price = prices[j] + "元";
                            String praiseNum = (praiseNums[j] > 0) ? praiseNums[j]
                                    + "贊"
                                    : "0";
                            System.out.println((j + 1) + "\t" + dishNames[j]
                                    + " \t" + price);
                        }
                        // 點菜
                        System.out.print("請您選擇要點的菜品編號：");
                        int chooseDish = input.nextInt();
                        System.out.print("請選擇您需要的份數：");
                        int number = input.nextInt();
                        String dishMeg = dishNames[chooseDish - 1] + " "
                                + number + "份";
                        double sumPrice = prices[chooseDish - 1] * number;
                        double deliCharge = (sumPrice >= 50) ? 0 : 5;// 滿50免送餐費
                        System.out.print("請輸入送餐時間(送餐時間是10點至20點間整點送餐)：");
                        int time = input.nextInt();
                        while (time < 10 || time > 20) {
                            System.out.print("您輸入的時間有誤，請輸入10~20間的整數！");
                            time = input.nextInt();
                        }
                        // 訂單信息
                        System.out.print("請輸入送餐地址：");
                        String address = input.next();
                        System.out.println("訂餐成功！");
                        System.out.println("您訂的是：" + dishMeg);
                        System.out.println("送餐時間是：" + time + "點");
                        System.out.println("餐費" + sumPrice + "元,送餐費"
                                + deliCharge + "元，總計："
                                + (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("對不起，您的餐袋已滿！");
                }
                break;
            case 2:// 查看餐袋
                System.out.println("****查看餐袋****");
                System.out.println("序號\t訂餐人\t餐品信息\t\t送餐日期"
                        + "\t送餐地址\t\t總金額\t訂單狀態");
                for (int i = 0; i < names.length; i++) {
                    if (names[i] != null) {
                        String state = (states[i] == 0) ? "已預訂" : "已完成";
                        String date = times[i] + "日";
                        String sumPrice = sumPrices[i] + "元";
                        System.out.println((i + 1) + "\t" + names[i] + "\t"
                                + dishMegs[i] + "\t" + date + "\t"
                                + addresses[i] + "\t" + sumPrice + " \t"
                                + state);
                    }
                }
                break;
            case 3:// 簽收訂單
                System.out.println("****簽收訂單****");
                boolean isSignFind = false;// 找到要簽收的訂單
                System.out.print("請選擇要簽收的訂單序號：");
                int choose1 = input.nextInt();
                for (int i = 0; i < names.length; i++) {
                    if (names[i] != null && states[i] == 0 && choose1 == i + 1) {
                        // 狀態為已預訂，序號為用戶輸入的訂單序號減1,可簽收。
                        // 狀態為已完成，序號為用戶輸入的訂單序號減1，不可簽收。
                        states[i] = 1;// 將狀態值置為已完成
                        System.out.println("訂單簽收成功！");
                        isSignFind = true;// 已找到此訂單
                    } else if (names[i] != null && states[i] == 1
                            && choose1 == i + 1) {
                        System.out.println("您選擇的訂單已完成簽收，不能再次簽收！");
                        isSignFind = true;// 已找到此訂單
                    }
                }
                if (!isSignFind) {
                    System.out.println("您選擇的訂單不存在！");// 未找到訂單
                }
                break;
            case 4:// 刪除訂單
                System.out.println("****簽收訂單****");
                boolean isdelFind = false;// 是否刪除找到的訂單
                System.out.print("請輸入要刪除的訂單序號：");
                int choose2 = input.nextInt();
                for (int i = 0; i < names.length; i++) {
                    // 狀態為已預訂，序號為用戶輸入的訂單序號減1,可刪除。
                    // 狀態為已完成，序號為用戶輸入的訂單序號減1，不可刪除。
                    if (names[i] != null && states[i] == 1 && choose2 == i + 1) {
                        isdelFind = true;// 已找到訂單
                        // 刪除操作，刪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("刪除訂單成功！");
                        break;
                    } else if (names[i] != null && states[i] == 0
                            && choose2 == i + 1) {
                        System.out.println("您選擇的訂單未簽收，不能刪除！");
                        isdelFind = true;// 已找到訂單
                    }
                }
                if (!isdelFind) {
                    System.out.println("您要刪除的訂單不存在！");
                }

                break;
            case 5:// 我要點贊
                System.out.println("****我要點贊****");
                // 展示菜品信息
                System.out.println("序號" + "\t" + "菜名" + "\t" + "單價");
                for (int i = 0; i < dishNames.length; i++) {
                    String price = prices[i] + "元";
                    String praiseNum = (praiseNums[i] > 0) ? praiseNums[i]
                            + "贊" : "0";
                    System.out.println((i + 1) + "\t" + dishNames[i] + "\t"
                            + price + "\t" + praiseNum);
                }
                System.out.print("請選擇您要點贊的菜品序號：");
                int choose3 = input.nextInt();
                praiseNums[choose3 - 1]++;
                System.out.println("點贊成功！");
                break;
            case 6:// 退出系統
                flag = true;
                break;
            default:
                // 退出系統
                flag = true;
                break;
            }
            if (!flag) {
                System.out.print("輸入0返回！");
                num = input.nextInt();
            } else {
                break;
            }
        } while (num == 0);
        System.out.println("謝謝使用。歡迎下次光臨！");
    }

}