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  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  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);
 }
}