制作一个 class ，当创建一个新实例时，它被添加到一个 hasmap

Question

Basically I want to make a class which when a new instance of it is made it adds itself to a hashmap, this class has inheritance classes which I also want to perform a similar function, the hashmap function has to be a class itself. hashmap 也不能直接操作。

有什么帮助吗？

我有这个

    public product(String name, String description, double price){
        setProductID(++count);
        Product_Name = name;
        Product_Description = description;
        Product_Price = price;
    }


public class productDB {
    HashMap<Integer, String> ProductDB = new HashMap<>();

    public void add() {
        Scanner sc = new Scanner(System.in);
        System.out.println("Please enter the name of the product you wish to enter into the database: ");
        String productName = sc.nextLine();
        System.out.println("Please enter the description of the product you wish to enter into the database: ");
        String productDesc = sc.nextLine();
        System.out.println("Please enter the price of the product you wish to enter:  ");
        int price = sc.nextInt();
        product product = new product(productName, productDesc, price);
        ProductDB.put(product.getProductID(), productName);
        System.out.println(product.getProductID() + " Is the ID of the product you have just entered");
    }