基于JavaSE数组、循环实现的简单订餐系统

一、需求

需求：开发一个网上订餐系统，需要实现以下模块

1. 我要订餐
2. 查看餐袋
3. 签收订单
4. 删除订单
5. 我要点赞

二、功能实现

1.数据准备

//构建扫描仪对象
        Scanner scanner = new Scanner(System.in);

        //系统数据主体，一整条订单信息
        //订餐人姓名
        String[] names = new String[4];
        //所选菜品
        String[] dishMegs = new String[4];
        //送餐时间
        int[] times = new int[4];
        //送餐地址
        String[] addresses = new String[4];
        //订单状态
        int[] states = new int[4];
        //订单总金额
        double[] sumMoneys = new double[4];

        //订单信息
        //初始化第一条订单信息
        names[0] = "叶伏天";
        dishMegs[0] = "红烧带鱼2份";
        times[0] = 12;
        addresses[0] = "紫薇星域天宫";
        states[0] = 1;
        sumMoneys[0] = 76.0;
        //初始化第二条订单信息
        names[1] = "花解语";
        dishMegs[1] = "鱼香肉丝2份";
        times[1] = 12;
        addresses[1] = "紫薇星域天宫";
        states[1] = 0;
        sumMoneys[1] = 45.0;

        //可供选择的菜品信息
        String[] dishNames = {"红烧带鱼","鱼香肉丝","时令鲜蔬"};
        double[] prices = {38,20,10};
        int[] praiseNums = new int[3];

2.实现我要订餐

int num = -1;
        boolean isExit = false;
        //创建显示面板
        System.out.println("欢迎使用“吃货联盟订餐系统”");
        do{
            System.out.println("*************************");
            System.out.println("1.我要订餐"+"\n"+"2.查看餐袋"+"\n"+"3.签收订单");
            System.out.println("4.删除订单"+"\n"+"5.我要点赞"+"\n"+"6.退出系统");
            System.out.println("*************************");

            System.out.print("请选择(输入错误将直接退出系统)：");
            //记录用户所选择的功能编号
            int choose = scanner.nextInt();
            switch (choose){
                case 1:
                    System.out.println("我要订餐");
                    //记录是否可以订餐
                    boolean isAdd = false;
                    for (int i = 0; i < names.length; i++) {
                        //知道数组中的空值的位置，添加订单信息
                        if(names[i] == null){
                            //标记位置
                            isAdd = true;
                            System.out.print("请输入用餐人姓名：");
                            String name = scanner.next();
                            //显示可选菜品的信息
                            System.out.println("序号"+"\t"+"菜品"+"\t"+"\t"+"单价"+"\t"+"\t"+"点赞");
                            for (int j = 0; j < dishNames.length; j++) {
                                String price = prices[j]+"元";
                                String praiseNum = (praiseNums[i]) > 0 ? praiseNums[i]+"赞" : "0";
                                System.out.println((j+1)+"\t"+dishNames[j]+"\t"+price+"\t"+praiseNum);
                            }
                            //用户点菜
                            System.out.print("请选择您要购买的菜品编号：");
                            int chooseDish = scanner.nextInt();
                            System.out.print("请输入购买份数：");
                            int number = scanner.nextInt();
                            String dishMeg = dishNames[chooseDish-1]+" "+number+"份";
                            double sumPrice = prices[chooseDish-1] * number;
                            //购买金额满50，送5元餐费
                            double deliCharge = (sumPrice > 50) ? 0:5;

                            System.out.print("请输入送餐时间（具体送餐时间是10点~20点整）：");
                            int time = scanner.nextInt();
                            while (time < 10 || time >20){
                                System.out.print("您输入的时间有误，请输入10~20之间的整数:");
                                time = scanner.nextInt();
                            }
                            System.out.print("请输入送餐地址：");
                            String address = scanner.next();

                            //状态默认为0（已预定）
                            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");

                            //添加数据
                            names[i] = name;
                            dishMegs[i] = dishMeg;
                            times[i] = time;
                            addresses[i] = address;
                            sumMoneys[i] = sumPrice+deliCharge;
                            break;
                        }
                        if(!isAdd){
                            System.out.println("已有"+(i+1)+"条订单");
                        }
                    }
                    break;

2.实现查看餐袋

case 2:
                    System.out.println("查看餐袋");
                    System.out.println("序号"+"\t"+"订餐人"+"\t"+"餐品信息"+"\t"+"\t"+
                                        "送餐时间"+"\t"+"送餐地址"+"\t"+"\t"+"总金额"+"\t"+"订单状态");
                    for (int i = 0; i < names.length; i++) {
                        if(names[i] != null){
                            String state = (states[i] == 0) ? "已预定":"已完成";
                            String date = times[i]+"点";
                            String sumMoney = sumMoneys[i]+"元";
                            System.out.println((i+1)+"\t"+names[i]+"\t"+"\t"+dishMegs[i]+"\t"+date+"\t"+addresses[i]+"\t"+sumMoney+"\t"+state);
                        }
                    }
                    break;

3.实现签收订单

case 3:
                    System.out.println("签收订单");
                    //找到要签收的订单
                    boolean isSignFind = false;
                    System.out.print("请选择想要签收的订单：");
                    int signOrderId = scanner.nextInt();
                    for (int i = 0; i < names.length; i++) {
                        //状态为已预定，序号为用户输入的订单序号-1 : 可签收
                        //状态为已完成，序号为用户输入的订单序号-1 : 不可签收
                        if(names[i] != null && states[i] == 0 && signOrderId == i+1){
                            //将状态更改为已完成
                            states[i] = 1;
                            System.out.println("订单签收成功！");
                            //标记为已经找到此订单
                            isSignFind = true;
                        }else if(names[i] != null && states[i] == 1 && signOrderId == i+1){
                            System.out.println("您选择的订单已完成签收，不能再次签收！");
                            //标记已找到此订单
                            isSignFind = true;
                        }
                    }
                    //未找到订单号 : 不可签收
                    if(!isSignFind){
                        System.out.println("您选择的订单不存在！！！");
                    }
                    break;

4.实现删除订单

case 4:
                    System.out.println("删除订单");
                    //标记是否找到要删除的订单
                    boolean isDelFind = false;
                    System.out.print("请输入要删除的订单序号：");
                    int intdelId = scanner.nextInt();
                    for (int i = 0; i < names.length; i++) {
                        //状态值为已完成，序号值为用户输入的序号-1 : 可删除
                        //状态值为已预定，序号值为用户输入的序号-1 : 不可删除
                        if(names[i] != null && states[i] ==1 && intdelId == i+1){
                            //标记已找到此订单
                            isDelFind = true;
                            //执行删除操作 : 删除位置后的元素依次前移
                            for (int j = intdelId; 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];
                                sumMoneys[j] = sumMoneys[j+1];
                            }
                            //清空最后一位
                            int ebdIndex = names.length-1;
                            names[ebdIndex] = null;
                            dishMegs[ebdIndex] = null;
                            times[ebdIndex] = 0;
                            addresses[ebdIndex] = null;
                            states[ebdIndex] = 0;
                            sumMoneys[ebdIndex] = 0;
                            System.out.println("删除订货单成功!!!");
                            break;
                        }else if(names[i] != null && states[i] == 0 && intdelId == i+1){
                            System.out.println("您选择的订单未签收，不能删除该订单");
                            isDelFind = true;
                            break;
                        }
                    }
                    //未找到该序号的订单信息 : 不能删除
                    if(!isDelFind){
                        System.out.println("您要删除的订单信息不存在！");
                    }
                    break;

5.实现我要点赞

case 5:
                    System.out.println("我要点赞");
                    //显示菜品信息
                    System.out.println("序号"+"\t"+"菜名"+"\t"+"\t"+"单价");
                    for (int i = 0; i < dishNames.length; i++) {
                        String price = prices[i]+"元";
                        String priaiseNum = (praiseNums[i]) > 0 ? praiseNums[i]+"赞":"";
                        System.out.println((i+1)+"\t"+dishNames[i]+"\t"+price+"\t"+priaiseNum);
                    }
                    System.out.print("请选择您要点赞的菜品序号：");
                    int priaiseNum = scanner.nextInt();
                    //点赞数+1
                    praiseNums[priaiseNum-1]++;
                    System.out.println("点赞成功！");
                    break;

6.实现退出系统

case 6:
                    //退出系统
                    isExit = true;
                    break;
                default:
                    //退出系统
                    isExit = true;
                    break;
            }

7.实现返回主菜单

//根据用户所选的编号，执行对应操作
            if(!isExit){
                System.out.print("输入0返回主菜单：");
                num = scanner.nextInt();
            }else {
                break;
            }
        }while (num == 0);

三、项目整体实现代码

public static void main(String[] args) {

        //构建扫描仪对象
        Scanner scanner = new Scanner(System.in);

        //系统数据主体，一整条订单信息
        //订餐人姓名
        String[] names = new String[4];
        //所选菜品
        String[] dishMegs = new String[4];
        //送餐时间
        int[] times = new int[4];
        //送餐地址
        String[] addresses = new String[4];
        //订单状态
        int[] states = new int[4];
        //订单总金额
        double[] sumMoneys = new double[4];

        //订单信息
        //初始化第一条订单信息
        names[0] = "张晴";
        dishMegs[0] = "红烧带鱼2份";
        times[0] = 12;
        addresses[0] = "天成路207号";
        states[0] = 1;
        sumMoneys[0] = 76.0;
        //初始化第二条订单信息
        names[1] = "张晴";
        dishMegs[1] = "鱼香肉丝2份";
        times[1] = 12;
        addresses[1] = "天成路207号";
        states[1] = 0;
        sumMoneys[1] = 45.0;

        //可供选择的菜品信息
        String[] dishNames = {"红烧带鱼","鱼香肉丝","时令鲜蔬"};
        double[] prices = {38,20,10};
        int[] praiseNums = new int[3];

        int num = -1;
        boolean isExit = false;
        //创建显示面板
        System.out.println("欢迎使用“吃货联盟订餐系统”");
        do{
            System.out.println("*************************");
            System.out.println("1.我要订餐"+"\n"+"2.查看餐袋"+"\n"+"3.签收订单");
            System.out.println("4.删除订单"+"\n"+"5.我要点赞"+"\n"+"6.退出系统");
            System.out.println("*************************");

            System.out.print("请选择(输入错误将直接退出系统)：");
            //记录用户所选择的功能编号
            int choose = scanner.nextInt();
            switch (choose){
                case 1:
                    System.out.println("我要订餐");
                    //记录是否可以订餐
                    boolean isAdd = false;
                    for (int i = 0; i < names.length; i++) {
                        //知道数组中的空值的位置，添加订单信息
                        if(names[i] == null){
                            //标记位置
                            isAdd = true;
                            System.out.print("请输入用餐人姓名：");
                            String name = scanner.next();
                            //显示可选菜品的信息
                            System.out.println("序号"+"\t"+"菜品"+"\t"+"\t"+"单价"+"\t"+"\t"+"点赞");
                            for (int j = 0; j < dishNames.length; j++) {
                                String price = prices[j]+"元";
                                String praiseNum = (praiseNums[i]) > 0 ? praiseNums[i]+"赞" : "0";
                                System.out.println((j+1)+"\t"+dishNames[j]+"\t"+price+"\t"+praiseNum);
                            }
                            //用户点菜
                            System.out.print("请选择您要购买的菜品编号：");
                            int chooseDish = scanner.nextInt();
                            System.out.print("请输入购买份数：");
                            int number = scanner.nextInt();
                            String dishMeg = dishNames[chooseDish-1]+" "+number+"份";
                            double sumPrice = prices[chooseDish-1] * number;
                            //购买金额满50，送5元餐费
                            double deliCharge = (sumPrice > 50) ? 0:5;

                            System.out.print("请输入送餐时间（具体送餐时间是10点~20点整）：");
                            int time = scanner.nextInt();
                            while (time < 10 || time >20){
                                System.out.print("您输入的时间有误，请输入10~20之间的整数:");
                                time = scanner.nextInt();
                            }
                            System.out.print("请输入送餐地址：");
                            String address = scanner.next();

                            //状态默认为0（已预定）
                            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");

                            //添加数据
                            names[i] = name;
                            dishMegs[i] = dishMeg;
                            times[i] = time;
                            addresses[i] = address;
                            sumMoneys[i] = sumPrice+deliCharge;
                            break;
                        }
                        if(!isAdd){
                            System.out.println("已有"+(i+1)+"条订单");
                        }
                    }
                    break;


                case 2:
                    System.out.println("查看餐袋");
                    System.out.println("序号"+"\t"+"订餐人"+"\t"+"餐品信息"+"\t"+"\t"+
                                        "送餐时间"+"\t"+"送餐地址"+"\t"+"\t"+"总金额"+"\t"+"订单状态");
                    for (int i = 0; i < names.length; i++) {
                        if(names[i] != null){
                            String state = (states[i] == 0) ? "已预定":"已完成";
                            String date = times[i]+"点";
                            String sumMoney = sumMoneys[i]+"元";
                            System.out.println((i+1)+"\t"+names[i]+"\t"+"\t"+dishMegs[i]+"\t"+date+"\t"+addresses[i]+"\t"+sumMoney+"\t"+state);
                        }
                    }
                    break;


                case 3:
                    System.out.println("签收订单");
                    //找到要签收的订单
                    boolean isSignFind = false;
                    System.out.print("请选择想要签收的订单：");
                    int signOrderId = scanner.nextInt();
                    for (int i = 0; i < names.length; i++) {
                        //状态为已预定，序号为用户输入的订单序号-1 : 可签收
                        //状态为已完成，序号为用户输入的订单序号-1 : 不可签收
                        if(names[i] != null && states[i] == 0 && signOrderId == i+1){
                            //将状态更改为已完成
                            states[i] = 1;
                            System.out.println("订单签收成功！");
                            //标记为已经找到此订单
                            isSignFind = true;
                        }else if(names[i] != null && states[i] == 1 && signOrderId == i+1){
                            System.out.println("您选择的订单已完成签收，不能再次签收！");
                            //标记已找到此订单
                            isSignFind = true;
                        }
                    }
                    //未找到订单号 : 不可签收
                    if(!isSignFind){
                        System.out.println("您选择的订单不存在！！！");
                    }
                    break;


                case 4:
                    System.out.println("删除订单");
                    //标记是否找到要删除的订单
                    boolean isDelFind = false;
                    System.out.print("请输入要删除的订单序号：");
                    int intdelId = scanner.nextInt();
                    for (int i = 0; i < names.length; i++) {
                        //状态值为已完成，序号值为用户输入的序号-1 : 可删除
                        //状态值为已预定，序号值为用户输入的序号-1 : 不可删除
                        if(names[i] != null && states[i] ==1 && intdelId == i+1){
                            //标记已找到此订单
                            isDelFind = true;
                            //执行删除操作 : 删除位置后的元素依次前移
                            for (int j = intdelId; 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];
                                sumMoneys[j] = sumMoneys[j+1];
                            }
                            //清空最后一位
                            int ebdIndex = names.length-1;
                            names[ebdIndex] = null;
                            dishMegs[ebdIndex] = null;
                            times[ebdIndex] = 0;
                            addresses[ebdIndex] = null;
                            states[ebdIndex] = 0;
                            sumMoneys[ebdIndex] = 0;
                            System.out.println("删除订货单成功!!!");
                            break;
                        }else if(names[i] != null && states[i] == 0 && intdelId == i+1){
                            System.out.println("您选择的订单未签收，不能删除该订单");
                            isDelFind = true;
                            break;
                        }
                    }
                    //未找到该序号的订单信息 : 不能删除
                    if(!isDelFind){
                        System.out.println("您要删除的订单信息不存在！");
                    }
                    break;


                case 5:
                    System.out.println("我要点赞");
                    //显示菜品信息
                    System.out.println("序号"+"\t"+"菜名"+"\t"+"\t"+"单价");
                    for (int i = 0; i < dishNames.length; i++) {
                        String price = prices[i]+"元";
                        String priaiseNum = (praiseNums[i]) > 0 ? praiseNums[i]+"赞":"";
                        System.out.println((i+1)+"\t"+dishNames[i]+"\t"+price+"\t"+priaiseNum);
                    }
                    System.out.print("请选择您要点赞的菜品序号：");
                    int priaiseNum = scanner.nextInt();
                    //点赞数+1
                    praiseNums[priaiseNum-1]++;
                    System.out.println("点赞成功！");
                    break;
                case 6:
                    //退出系统
                    isExit = true;
                    break;
                default:
                    //退出系统
                    isExit = true;
                    break;
            }

            //根据用户所选的编号，执行对应操作
            if(!isExit){
                System.out.print("输入0返回主菜单：");
                num = scanner.nextInt();
            }else {
                break;
            }
        }while (num == 0);

    }