大一水果摊项目

项目名

水果摊售货系统

项目描述

该系统类似于超市收银系统,由收银员操作,包括添加商品进购物车,结账以及找零

控制台界面

具体功能

查看水果列表

购买水果

可以是输入水果名,也可以是输入水果编号

查看购物车

结账

退出

要求

使用数组或集合完成数据存储

使用IO流实现数据的读入和写出

独立完成,不会可以请教一下其他人

父类：水果类

public class Fruit {
    private  String name;
    private  double price;
    private  int num;
    Fruit(){

    }
    public Fruit(String name, double price) {
        this.name = name;
        this.price = price;
    }
    @Override
    public String toString() {
        return "Fruit{" +
                "name='" + name + ''' +
                ", price=" + price +
                ", num=" + num +
                '}';
    }



    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public int getNum() {
        return num;
    }

    public void setNum(int num) {
        this.num = num;
    }
}

几种水果的子类，继承于水果类

public class apple extends Fruit{
    public apple(String name, double price) {
        super(name, price);
    }

 //子类应该不用添加get和set方法吧。
}
class pear extends Fruit{

    public pear(String name, double price) {
        super(name,  price);
    }
}
class banana extends Fruit{

    public banana(String name,double price) {
        super(name, price);
    }
}
class putao extends Fruit{

    public putao(String name, double price) {
        super(name, price);
    }
}

购物，结账，查看购物车：

import java.util.Scanner;

public class BuyCar {
    Scanner g = new Scanner(System.in);
    static int p = 0;
    static double s = 0;
    static Fruit[] F = new Fruit[4];//这是对象数组，储存对象

    public static void bu(Fruit fruit) {
        F[p++] = fruit;
    }//用这个方法来添加水果

    public void sum() {
        int sumPrice=0;
        for (int i = 0; i < p; i++) {
            sumPrice += F[i].getPrice() * F[i].getNum();//用这个循环来算买水果花了多少钱。
            System.out.println("您这次一共消费了" + sumPrice + "元");
        }
        Scanner scanner = new Scanner(System.in);
        System.out.println("请支付：");
        int i = scanner.nextInt();
        int sum=i-sumPrice;
        if(sum >=0){
            System.out.println("找零："+sum+"元");
        }else {
            System.out.println("还需支付"+sum+"元");
        }//这个是最后的支付环节的操作
        Fivechoose fivechoose = new Fivechoose();
        fivechoose.ty();
        fivechoose.opo();
    }

    public void see() {
        System.out.println("您的购物车如下：");
        for (int j = 0; j < p; j++) {
            System.out.println(F[j].toString());//查看购物车，调用tostring方法，来看水果的具体信息。

        }
    }
}

实现用户点击按键实现相应需求：

import java.util.Scanner;

public class Fivechoose {
    public  void ty(){
        System.out.println("请选择业务类型");
        System.out.println("1.查看水果列表，2.购买水果，3.查看购物车，4.结账，5.退出");
    }

    public void opo() {
        shopping n = new shopping();
        BuyCar b = new BuyCar();
        FruitList l = new FruitList();
//        ty();
        Scanner v = new Scanner(System.in);
        switch (v.nextInt()) {
            case 1:
                l.ma();
                System.out.println("======================");
                ty();
                opo();
                break;
            case 2:
                ty();
                l.ma();
                n.main();
                break;
            case 3:
                b.see();
                ty();
                opo();
                break;
            case 4:
                b.sum();
                break;
            case 5:
                n.exit();
                break;
            default:
                System.out.println("菜单无此选项,请重新选择");
                opo();
        }
    }}

业务列表：

class business{
    public static void ty(){
        System.out.println("请选择业务类型");
        System.out.println("1.查看水果列表，2.购买水果，3.查看购物车，4.结账，5.退出");
    }
}

录入水果信息：

import java.util.Scanner;

public class FruitList {
    public void ma() {
        Scanner s=new Scanner(System.in);
            Fruit a=new apple("苹果",5.0);//5.6.7.10
            Fruit pe=new apple("梨",6.0);//5.6.7.10
            Fruit ba=new apple("香蕉",7.0);//5.6.7.10
            Fruit pu=new apple("葡萄",10.0);//5.6.7.10
            System.out.println("水果名："+a.getName()+"单价："+a.getPrice()+"/斤");
            System.out.println("水果名："+ pe.getName()+"单价："+pe.getPrice()+"/斤");
            System.out.println("水果名："+ba.getName()+"单价："+ba.getPrice()+"/斤");
            System.out.println("水果名："+pu.getName()+"单价："+pu.getPrice()+"/斤");
        }
}

对于输入错误情况的处理：

import java.util.Scanner;

public class InputEorr {
    shopping up=new shopping();
    Scanner sc =new Scanner(System.in);
    int mi=sc.nextInt();
    public void i2(){
        switch (mi){
            case 1:
                new Fivechoose().ty();
               up.main();
                break;
            case 0:
                Fivechoose i2=new Fivechoose();
                i2.opo();
                break;
            default:
                System.out.println("输入有误，请重新输入");
        }
    }

}

判断输入的是数字还是字符从而跳转到相应操作：

import java.util.Scanner;
public class Jurge {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入数值：");
        String s = input.next();
        if (s != null && s.matches("^[0.0-9.0]+$"))  {// [0-9]没办法识别小数，[0.0-9.0]可以识别小数和整数
            System.out.println("输入是数字！");
            double num = Double.parseDouble(s);
            System.out.println(num);
        } else {
            System.out.println("输入值为字符！");
        }
    }
}

购物选项及其操作：

import java.util.Scanner;

public class shopping {
    Scanner sc = new Scanner(System.in);
    BuyCar io = new BuyCar();
    Fivechoose i8 = new Fivechoose();

    public void main() {

        System.out.println("--------------------");
        System.out.println("请选择需要购买的商品");
        Scanner input = new Scanner(System.in);
        String s = input.nextLine();

        if (s != null && s.matches("^[1.0-4.0]+$")) {
            int sd = Integer.parseInt(s);
            switch (sd) {
                case 1:
                    Fruit a = new apple("苹果", 5.0);
                    io.bu(a);
                    System.out.println("请输入需要购买的数量");
                    a.setNum(sc.nextInt());
                    System.out.println("继续购物请输入1，返回请输入0");
                    int mi = sc.nextInt();
                    if (mi == 1) {
                        main();

                    } else if (mi == 0) {
                        new Fivechoose().ty();
                        i8.opo();
                    } else {
                        System.out.println("抱歉，您输入的选项不存在");
                    }
                    break;
                case 2:
                    Fruit pe = new apple("梨", 6.0);
                    io.bu(pe);
                    System.out.println("请输入需要购买的数量");
                    pe.setNum(sc.nextInt());
                    System.out.println("继续购物请输入1，返回请输入0");
                    int y = sc.nextInt();
                    switch (y) {
                        case 1:
                            new Fivechoose().ty();
                            main();
                            break;
                        case 0:
                            new Fivechoose().ty();
                            i8.opo();
                            break;
                        default:
                            System.out.println("抱歉，您输入的选项不存在");
                    }
                    if (sc.nextInt() == 1) {
                        new Fivechoose().ty();
                        main();
                    } else if (sc.nextInt() == 0) {
                        new Fivechoose().ty();
                    }
                    break;
                case 3:
                    Fruit ba = new apple("香蕉", 7.0);
                    io.bu(ba);
                    System.out.println("请输入需要购买的数量");
                    ba.setNum(sc.nextInt());
                    System.out.println("继续购物请输入1，返回请输入0");
                    int o = sc.nextInt();
                    switch (o) {
                        case 1:
                            new Fivechoose().ty();
                            main();
                            break;
                        case 0:
                            new Fivechoose().ty();
                            Fivechoose i2 = new Fivechoose();
                            i2.opo();
                            break;
                        default:
                            System.out.println("抱歉，您输入的选项不存在");
                    }
                    break;
                case 4:
                    Fruit pu = new apple("葡萄", 10.0);
                    io.bu(pu);
                    System.out.println("请输入需要购买的数量");
                    pu.setNum(sc.nextInt());
                    System.out.println("继续购物请输入1，返回请输入0");
                    int m = sc.nextInt();
                    switch (m) {
                        case 1:
                            new Fivechoose().ty();
                            main();
                            break;
                        case 0:
                            new Fivechoose().ty();
                            Fivechoose i2 = new Fivechoose();
                            i2.opo();
                            break;
                        default:
                            System.out.println("抱歉，您输入的选项不存在");
                    }
                    break;
                default:
                    System.out.println("您的输入有误，请重新输入");
                    main();
            }
        } else {
            if (s.equals("苹果")) {
                Fruit a = new apple("苹果", 5.0);
                io.bu(a);
                System.out.println("请输入需要购买的数量");
                a.setNum(sc.nextInt());
                System.out.println("继续购物请输入1，返回请输入0");
                int m = sc.nextInt();
                switch (m) {
                    case 1:
                        new Fivechoose().ty();
                        main();
                        break;
                    case 0:
                        new Fivechoose().ty();
                        Fivechoose i2 = new Fivechoose();
                        i2.opo();
                        break;
                    default:
                        System.out.println("抱歉，您输入的选项不存在");
                }
            } else if (s.equals("梨")) {
                Fruit pe = new apple("梨", 6.0);
                io.bu(pe);
                System.out.println("请输入需要购买的数量");
                pe.setNum(sc.nextInt());
                System.out.println("继续购物请输入1，返回请输入0");
                int m = sc.nextInt();
                switch (m) {
                    case 1:
                        new Fivechoose().ty();
                        main();
                        break;
                    case 0:
                        new Fivechoose().ty();
                        Fivechoose i2 = new Fivechoose();
                        i2.opo();
                        break;
                    default:
                        System.out.println("抱歉，您输入的选项不存在");
                }
            } else if (s.equals("香蕉")) {
                Fruit ba = new apple("香蕉", 7.0);
                io.bu(ba);
                System.out.println("请输入需要购买的数量");
                ba.setNum(sc.nextInt());
                System.out.println("继续购物请输入1，返回请输入0");
                int u = sc.nextInt();
                switch (u) {
                    case 1:
                        new Fivechoose().ty();
                        main();

                        break;
                    case 0:
                        new Fivechoose().ty();
                        Fivechoose i2 = new Fivechoose();
                        i2.opo();
                        break;
                    default:
                        System.out.println("抱歉，您输入的选项不存在");
                }


            } else if (s.equals("葡萄")) {
                Fruit pu = new apple("葡萄", 10.0);
                io.bu(pu);
                System.out.println("请输入需要购买的数量");
                pu.setNum(sc.nextInt());
                System.out.println("继续购物请输入1，返回请输入0");
                int m = sc.nextInt();
                switch (m) {
                    case 1:
                        new Fivechoose().ty();
                        main();

                        break;
                    case 0:
                        new Fivechoose().ty();
                        Fivechoose i2 = new Fivechoose();
                        i2.opo();
                        break;
                    default:
                        System.out.println("抱歉，您输入的选项不存在");

                }
            } else {
                System.out.println("您的输入有误,请重新输入");
                main();
            }
        }

    }

    public void exit() {
        System.exit(0);
    }
}

大一水果摊项目

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