Java 【食品库存管理】

 //管理类
 class Manage{
     private ArrayList<Food> obj=null;
    
    Manage(){ //构造方法
        obj = new ArrayList<Food>();
    }
    public void addFood(Food food){ //普通方法
         obj.add(food);
         System.out.println("添加食品成功!");
    }
    public void spInfo(String coding){
        int i;
        for(i=0;i<obj.size();i++){
            Food sp = (Food)obj.get(i);
            if(sp.getCoding().equals(coding)){
                 System.out.println("该食品的信息:");
                 System.out.println("食品名称:"+sp.getName());
                 System.out.println("食品编号:"+coding);
                 System.out.println("食品价格:"+sp.getPrice());
                 break;
            }
        }
        if(i == obj.size()){
            System.out.println("对不起,没有此商品!");
        }
    }
    public void foodFix(String coding,double price){
         int i;
         for(i=0;i<obj.size();i++){
               Food sp = (Food)obj.get(i);
               if(sp.getCoding().equals(coding)){
                     sp.setPrice(price);
                     System.out.println("修改食品价格成功!");
                     break;
               }
         }
         if(i == obj.size()){
               System.out.println("没有找到相应的商品,修改失败!");
         }
       }
    public void foodDel(String coding){
              int i;
              if(obj.size()==0){
                      System.out.println("没有库存,请库存！");
              }
              for(i=0;i<obj.size();i++){
                    Food sp = (Food)obj.get(i);
                   if(sp.getCoding().equals(coding)){
                       obj.remove(i);
                       System.out.println("删除食品成功!");
                       break;
                  }
              }
              if((i==obj.size()) && (obj.size()!=0)){
                    System.out.println("对不起,没有此商品!");
              }
       }    
  }

 import java.util.*;
 import java.io.*;
 public class Jar{
     public static void main(String[] args) throws Exception{
          Manage foods = new Manage();
          //将键盘作为数据流接收
          //BufferedReader data  = new BufferedReader(new InputStreamReader(System.in));
         Scanner data = new Scanner(System.in);
          while(true){
              System.out.println("请按照提示选择:");
              System.out.println("添加食品:1");
              System.out.println("查找食品:2");
              System.out.println("修改食品价格:3");
              System.out.println("删除食品:4");
              System.out.println("退出:0");
          
          String str = data.next(); //读取一行
          if(str.equals("1")){
              System.out.println("请输入商品编号");
              String coding = data.next();
              System.out.println("请输入商品名称");
              String name = data.next();
              System.out.println("请输入商品价格");
              double price = data.nextDouble();
              Food food = new Food(coding,name,price);
              foods.addFood(food);

          }
          else if(str.equals("2")){
             System.out.println("请输入商品编号");
             String coding = data.next();
             foods.spInfo(coding);
          }
           else if(str.equals("3")){
                System.out.println("请输入商品编号");
              String coding = data.next();
              System.out.println("请输入商品价格");
              double price = data.nextDouble();
              foods.foodFix(coding,price);
          }
           else if(str.equals("4")){
               System.out.println("请输入商品编号");
             String coding = data.next();
             foods.foodDel(coding);

          }
          else if(str.equals("0")){
            System.out.println("感谢使用,下次再见!");
            System.exit(0);
              
          }else{
            System.out.println("输入有误");
          }
       }
     }
 }