create customer order class and order item class, using hibernate annotation, relationship one to many

@Entity
@Table(name = "orders")
public class Order implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(name = "total_amount")
    private Double totalAmount;
    
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "order")
    private List<OrderItem> orderItems;
    
    // getters and setters
}