此题模仿购物车。1)编写商品类，该类包含商品编号，名称，价格，说明等属性。2)编写订单项类OrderItemBean，该类包含商品和商品数量。

好的，我可以帮你进行编写。以下是商品类和订单项类的示例代码：

// 商品类
public class Product {
    private int id;
    private String name;
    private double price;
    private String description;

    public Product(int id, String name, double price, String description) {
        this.id = id;
        this.name = name;
        this.price = price;
        this.description = description;
    }

    // getters and setters
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

// 订单项类
public class OrderItem {
    private Product product;
    private int quantity;

    public OrderItem(Product product, int quantity) {
        this.product = product;
        this.quantity = quantity;
    }

    // getters and setters
    public Product getProduct() {
        return product;
    }

    public void setProduct(Product product) {
        this.product = product;
    }

    public int getQuantity() {
        return quantity;
    }

    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }
}

这两个类可以作为模拟购物车的基础，你可以根据需要进行扩展和使用。希望对你有帮助！如果还有其他问题，请继续提问。