小编Val*_*ica的帖子

@Entity

public class SalesT {

    @Id
    @GeneratedValue
    private int id;

    @OneToOne
    private Customer customer;

    @OneToMany(targetEntity = Product.class)
    private List< Map<Product,Integer> > listProduct;// I want to intialize this

    public SalesT() {
    }

    public SalesT(Customer customer, List<Map<Product, Integer>> product) {
        this.customer = customer;
        this.listProduct = product;
    }
}

我想初始化SalesT类的List <Map <Product，Integer >> listProduct属性，如何对其进行初始化？我尝试过这样

List<Map <Product, Integer>> listProduct = new ArrayList <HashMap <Product, Integer>>();

但它不起作用。

谢谢。