模拟超市生鲜价格系统

创建一个超市生鲜价格变动的系统

变更的规则

//由于天气原因 需要更新价格
//更新规则如下
//1.蔬菜每斤上涨0.50元，如果产地是江津地区，路途比较远涨价1.20元
//2.肉食价格每斤上涨2.00元，如果是山区放养每斤上涨5.88元
//3.水果价格如果是重庆本地生产涨价1.08元，外地生产上涨2.88元

//超市生鲜肉食价格表
西红柿,沙坪坝,3.00,vegetable
油麦菜,永川,1.50,vegetable
黄瓜,奉节,2.00,vegetablep
蒜薹,江津,2.20,vegetable
西红柿,云阳,3.00,vegetable
黄瓜,云阳,2.00,vegetable
油麦菜,云阳,1.50,vegetable
猪肉,山区放养,20.00,meat
猪肉,工厂饲养,10.00,meat
牛肉,山区放养,50.50,meat
牛肉,工厂饲养,35.8,meat
苹果,江津,3.50,fruit
香蕉,广东,2.50,fruit
香梨,库尔勒,3.30,fruit
芭蕉,江津,3.00,fruit
苹果,三门峡,3.30,fruit
苹果,陕西,3.50,fruit

创建生鲜类

public class Fresh {
    //菜名
    private String name;
    //价格
    private String place;
    //产地
    private double price;
    //属于什么类型
    private String var;

    public Fresh() {
    }

    public Fresh(String name, String place, double price, String var) {
        this.name = name;
        this.place = place;
        this.price = price;
        this.var = var;
    }

    public String getName() {
        return name;
    }

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

    public String getPlace() {
        return place;
    }

    public void setPlace(String place) {
        this.place = place;
    }

    public double getPrice() {
        return price;
    }

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

    public String getVar() {
        return var;
    }

    public void setVar(String var) {
        this.var = var;
    }
}

创建超市类

public class SuperMarket {
    public static void main(String[] args) {
        //从文件中读取 创建一个菜品列表，拿到菜表(未更新)
        ArrayList<Fresh> freshes = marketFreshTable(new ArrayList<>());

        //System.out.println(freshes);
		//按照要求更新菜品的价格
        updateVegetable(freshes);
		//把更新后的菜品价格写到文件中(读取的原文)，并且用横线隔开
        writeToFile(freshes);


}

读取菜单，并且创建菜品列表

public static  ArrayList<Fresh> marketFreshTable(ArrayList<Fresh> freshes){
    try{
        BufferedReader read = new BufferedReader(new FileReader("D:\\学习资料\\超市生鲜.txt"));
        String str = null;
        while((str = read.readLine()) != null) {
            if(!str.equals("")){
                String[] line = str.split(",");
                Fresh fresh = new Fresh();
                fresh.setName(line[0]);
                fresh.setPlace(line[1]);
                fresh.setPrice(Double.parseDouble(line[2]));
                fresh.setVar(line[3]);
                freshes.add(fresh);
            }

        }
    }
    catch (Exception e){
        System.out.println(e);
    }
    return freshes;
 }

定义属于重庆地区的enum

   //属于重庆的地方
    public enum ChongQin{
        江津,云阳,永州,奉节,沙坪坝;
    }

更新菜单，按照要求

//提供 价格表，并且提供是什么类型的生鲜
    public static ArrayList<Fresh> updateVegetable(ArrayList<Fresh> freshes){


        for (int i = 0; i < freshes.size(); i++) {
          Fresh  fresh = freshes.get(i);

              switch (fresh.getVar()){
                  case "vegetable":
                      if(fresh.getPlace().equals("江津")){
                          fresh.setPrice(fresh.getPrice() + 1.2);
                      }
                      else {
                          fresh.setPrice(fresh.getPrice() + 0.5);
                      }
                      break;
                  case "meat":
                      if(fresh.getPlace().equals("山区放养")){
                          fresh.setPrice(fresh.getPrice() + 5.88);
                      }
                      else {
                          fresh.setPrice(fresh.getPrice() + 2);
                      }
                      break;
                  case "fruit":
                      boolean flag = false;
                      for (ChongQin place:ChongQin.values()) {
                          if(fresh.getPlace().equals(place)){
                              flag =true;
                          }
                      }
                      if(flag){

//                    fresh.setPrice(fresh.getPrice() + 1.08);
                          fresh.setPrice(fresh.getPrice() + 1.08);
                      } else {
                          fresh.setPrice(fresh.getPrice() + 2.88);
                      }
                      break;
              }

          }


        return freshes;
    }

把更新的菜单写入到源文件中

    public static void writeToFile(ArrayList<Fresh> freshes) {
            try{
                FileWriter fw = new FileWriter("D:\\学习资料\\超市生鲜.txt",true);
                BufferedWriter bufw = new BufferedWriter(fw);
                bufw.write("----------------------------------------------\n");
                for (int i = 0; i < freshes.size(); i++) {
                    Fresh fresh = freshes.get(i);
                    String str = fresh.getName()+","+fresh.getPlace()+","+fresh.getPrice()+","+fresh.getVar()+"\n";
                    bufw.write(str);
                }
                bufw.close();
            }catch (Exception e){
                System.out.println(e);
            }
  }