JAVA吃貨聯盟項目。

1基礎通過數組、選擇結構、循環等實 現吃貨聯盟訂餐系統。

1、我要訂餐；

2、查看餐袋；

3、簽收訂單；

4、刪除訂單；

5、我要點贊；

6、退出系統；

public class Doy001 {
    public static void main(String[] args) {
                Scanner input = new Scanner(System.in);
                String[] names = new String[4];
                String[] dishMegs = new String[4];
                int[] times = new int[4];
                String[] addresses = new String[4];
                int[] states = new int[4];
                double[] sumPrices = new double[4];
                
                names[0] = "wuli丫頭";
                dishMegs[0] = "漢堡2份";
                times[0] = 12;
                addresses[0] = "青年路";
                sumPrices[0] = 76.0;
                states[0] = 1;
                // 第二條訂單信息
                names[1] = "wuli小仙女";
                dishMegs[1] = "脆皮雞2份";
                times[1] = 18;
                addresses[1] = "石佛營東里";
                sumPrices[1] = 45.0;
                states[1] = 0;
                // 菜品信息
                String[] dishNames = { "漢堡", "脆皮雞", "檸檬水" };
                double[] prices = new double[] { 38.0, 20.0, 10.0 };
                int[] praiseNums = new int[3];
                int num = -1;
                boolean flag = false;
                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:
                        System.out.println("****我要訂餐****");
                        boolean isAdd = false;
                        for (int i = 0; i < names.length; i++) {
                            if (names[i] == null) {
                                isAdd = true;
                                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) {
                                states[i] = 1;
                                System.out.println("訂單簽收成功！");
                                isSignFind = true;
                            } 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;
                            }
                        }
                        if (!isSignFind) {
                            System.out.println("您選擇的訂單不存在！");
                        }
                        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++) {
                            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！");
            

        
        
        
        
    }

}