java实现简单的小超市程序

package person;

public class Customer {
 public String name;
 public double money;
 public boolean isDrivingCar;
}

package supermarket;

public class LittleSuperMarket {
 public String superMarketName;
 public String address;
 public int parkingCount;
 public double incomingSum;
 public Merchandise[] merchandises;
 public int[] merchandisesold;
}

package supermarket;

public class Merchandise {
 public String name;
 public String id;
 public int count;
 public double soldPrice;
 public double purchasePrice;
}

import person.Customer;
import supermarket.LittleSuperMarket;
import supermarket.Merchandise;

import java.util.Scanner;

public class Run {
 public static void main(String[] args) {

  //通过小超市类创建超市实体
  LittleSuperMarket littleSuperMarket = new LittleSuperMarket();

  //为超市属性赋值
  littleSuperMarket.address = "世纪大道999号";
  littleSuperMarket.superMarketName = "我家超市";
  littleSuperMarket.parkingCount = 200;

  //为超市商品属性new一个大小为200的数组，类型为Merchandise
  littleSuperMarket.merchandises = new Merchandise[200];
  //创造下标相同的数组记录相同下标商品的卖出个数
  littleSuperMarket.merchandisesold = new int[littleSuperMarket.merchandises.length];


  //赋值
  for (int i = 0; i < littleSuperMarket.merchandises.length; i++) {
   //创建类型为merchandise的局部变量m，并为其赋值
   Merchandise m = new Merchandise();
   m.count = 200;
   m.id = "ID" + i;
   m.name = "商品" + i;
   m.purchasePrice = 200 * Math.random();
   m.soldPrice = (1 + Math.random()) * m.purchasePrice;

   //将每次局部变量的值赋给对应下标的merchandise实体，此时实体merchandise有了值
   littleSuperMarket.merchandises[i] = m;

  }
  System.out.println("超市开张了！! ！");


  boolean open = true;
  Scanner scanner = new Scanner(System.in);


  while (open) {
   System.out.println("本店叫做：" + littleSuperMarket.superMarketName);
   System.out.println("本店地址：" + littleSuperMarket.address);
   System.out.println("共拥有停车位：" + littleSuperMarket.parkingCount);
   System.out.println("今天的营业额为：" + littleSuperMarket.incomingSum);
   System.out.println("共有商品：" + littleSuperMarket.merchandises.length + "种");


   //为顾客的属性赋值
   Customer customer = new Customer();
   customer.name = "编号：" + ((int) (Math.random() * 500));
   customer.isDrivingCar = Math.random() > 0.4;
   customer.money = (1 + Math.random()) * 10000;


   //先判断顾客是否开车
   if (customer.isDrivingCar) {
    System.out.println("欢迎顾客" + customer.name + "号的顾客驾车而来！");
    //顾客开车的条件下车位数>0，车位减一，否则重新进入循环（车位小于零，顾客无法停车）
    if (littleSuperMarket.parkingCount > 0) {
     littleSuperMarket.parkingCount--;
     System.out.println("欢迎顾客" + customer.name + "号的顾客光临" + littleSuperMarket.superMarketName + ",车位剩余" + littleSuperMarket.parkingCount + "，钱包剩余" + customer.money);
    } else {
     System.out.println("对不起，停车位已满，欢迎下次光临");
     continue;
    }
    //没开车，直接进入
   } else {
    System.out.println("欢迎顾客" + customer.name + "号的顾客光临" + littleSuperMarket.superMarketName + "钱包剩余" + customer.money);
   }


   //在购买流程外部创建变量统计总共花费和购买数量
   double totalCast = 0;
   int numToBuy;


   //购买循环
   while (true) {


    System.out.println("本店提供" + littleSuperMarket.merchandises.length + "种商品，欢迎选购。请输入商品编号:");


    int InDex = scanner.nextInt();
    //对商品索引的合法性进行检测
    if (InDex <= 0) {
     break;
    }
    if (InDex > littleSuperMarket.merchandises.length - 1) {
     System.out.println("对不起，本店没有那么多商品。请输入0到" + (littleSuperMarket.merchandises.length - 1) + "之间的数字");
     continue;
    }


    System.out.println("您选购的商品的名字是:" + littleSuperMarket.merchandises[InDex].name + "\t售价为：" + littleSuperMarket.merchandises[InDex].soldPrice);
    System.out.println("请问你要买几个？");

    numToBuy = scanner.nextInt();
    //对购买数量的合法性进行检测
    if (numToBuy <= 0) {
     System.out.println("不买看看也好，欢迎继续选购");
     continue;
    }
    if (numToBuy > littleSuperMarket.merchandises[InDex].count) {
     System.out.println("本店没有那么多商品，欢迎继续挑选");
     continue;
    }
    /*其实这里的逻辑不太好，但是懒得改了，等再学习一段时间再好好完善这个小程序。这里把花费放在购买循环外面才是比较好的逻辑，然后在这里用if循环判断购买的一系列合法性即可。
     或者把售卖个数的属性也在这里改变赋值会容易懂，我这里放到后面了，懒得改了。等下次优化功能时再整体优化逻辑
     */

    //输入合法，求总共花费，并对商品库存进行相应的扣除
    totalCast += littleSuperMarket.merchandises[InDex].soldPrice * numToBuy;
    littleSuperMarket.merchandises[InDex].count -= numToBuy;


    //仍然属于合法性检测，检测顾客的钱是否够支付他所购买商品的总价
    if (customer.money < totalCast) {

     System.out.println("对不起，您身上的钱不足以支付您的商品，欢迎下次选购");
     //钱不足以支付，对应商品的数量再把刚才购买但未成功支付的商品数量归还
     //就像你在超市里买东西，放进购物车了，货架上超市库存少了，其他顾客拿不到了，等你支付时钱不够，商品被放回，其他顾客可以拿到的数量增加，即商品库存增加
     littleSuperMarket.merchandises[InDex].count += numToBuy;
     //这一段当时写的时候我也比较乱
     //因为总价计算在外面了，此时总价已将超出了你的钱数循环从这里出去如果总价不置零，你的钱数一直小于总价，该顾客一直无法购买商品
     totalCast = 0;

    } else {
     //正确购买，售出数量对应增加，顾客口袋里的钱对应减少
     littleSuperMarket.merchandisesold[InDex] += numToBuy;
     customer.money -= totalCast;

     //开车来的话，顾客离开，车位释放
     if (customer.isDrivingCar) {
      littleSuperMarket.parkingCount++;
     }
    }
   }

   littleSuperMarket.incomingSum += totalCast;
   //每次循环结束，该人总钱数得出将该人的totalCast累加到littleSuperMarket.incomingSum中，得出总共收入
   //littleSuperMarket.incomingSum和totalIncoming数值相等，基本为同一意思
   //littleSuperMarket.incomingSum += totalCast;

   System.out.println("顾客" + customer.name + "号的顾客共消费" + totalCast + "，还剩余" + customer.money);
   System.out.println("今天还要继续营业吗？");
   open = scanner.nextBoolean();
  }

  System.out.println("超市关门了！");
  System.out.println("今天总的营业额为" + littleSuperMarket.incomingSum + "营业情况如下：");


  //定义总收入和总净利润
  double totalNetIncoming = 0;
  double totalIncoming = 0;


  for (int i = 0; i < littleSuperMarket.merchandisesold.length; i++) {
   //只统计售出数量大于0的商品
   if (littleSuperMarket.merchandisesold[i] > 0) {
    //计算总利润和总净利润，通过累加求得
    double incoming = littleSuperMarket.merchandises[i].soldPrice * littleSuperMarket.merchandisesold[i];
    double netIncoming = (littleSuperMarket.merchandises[i].soldPrice - littleSuperMarket.merchandises[i].purchasePrice) * littleSuperMarket.merchandisesold[i];
    totalIncoming += incoming;
    totalNetIncoming += netIncoming;
    System.out.println(littleSuperMarket.merchandises[i].name + "售出了" + littleSuperMarket.merchandisesold[i] + "个。销售额为" + incoming + ",净利润为" + netIncoming);

   }
  }
  System.out.println("今日总销售额为：" + totalIncoming + ";今日总净利润为：" + totalNetIncoming);
 }
}