java - 用户将元素添加到数组列表

Question

我想让用户添加一个元素到一个已经存在的arraylist中，并添加一些与arraylist元素相关的变量，arraylist是:

所以我写了下面的代码:

           ArrayList<FruitShop> shops= new ArrayList<FruitShop>();
           Scanner in= new Scanner(System.in);

            FruitShop newShop = new FruitShop(null,0.0, new Apples(), new OwnerInfo());
            shops.add(newShop);
            System.out.println("What is the name of new shop?: ");
            newShop.setShopName(int.next());;
            System.out.println("Enter initial balance in USD: ");
            newShop.setBalance(Double.parseDouble(in.next()));
            System.out.println("Enter owner name: ");
            newShop.getShopOwner().setName(in.next());
            System.out.println("Enter owner age: ");
            newShop.getShopOwner().setAge(Integer.parseInt(in.next()));
            System.out.println("How many apples does the store have?: ");
            newShop.getApplesInfo().setQuantity(Integer.parseInt(in.next()));
            System.out.println("What is the price of each apple?:");
            newShop.getApplesInfo().setPrice(Double.parseDouble(in.next()));
            System.out.println("Your shop has been added! ");

           FruitShop.ID= ID;
            ID++;

这是从菜单“添加新水果店”中选择的东西，所以每次用户添加水果店时，对象都会被称为 newShop，然后旧的 newShop 将被删除!怎样才能避免那个错误呢？p.s: FruitShop 由其他类组成:Apples 和 OwnerInfo提前谢谢你。

Answer 1

 ArrayList<FruitShop> shops= new ArrayList<FruitShop>();
           Scanner in= new Scanner(System.in);

            FruitShop newShop = new FruitShop(null,0.0, new Apples(), new OwnerInfo());

            System.out.println("What is the name of new shop?: ");
            newShop.setShopName(int.next());;
            System.out.println("Enter initial balance in USD: ");
            newShop.setBalance(Double.parseDouble(in.next()));
            System.out.println("Enter owner name: ");
            newShop.getShopOwner().setName(in.next());
            System.out.println("Enter owner age: ");
            newShop.getShopOwner().setAge(Integer.parseInt(in.next()));
            System.out.println("How many apples does the store have?: ");
            newShop.getApplesInfo().setQuantity(Integer.parseInt(in.next()));
            System.out.println("What is the price of each apple?:");
            newShop.getApplesInfo().setPrice(Double.parseDouble(in.next()));
            System.out.println("Your shop has been added! ");
             shops.add(newShop); // add last of the line when all initialization is done.

Shift your statement shops.add(newShop); at last. After initialization is getting done.