我们将使用责任链模式和装饰者模式的组合。

考虑一个简化的餐厅订单处理系统，其中包括服务员（Waiter）、厨师（Chef）和收银员（Cashier）。订单从服务员开始，然后传递给厨师，最后到达收银员。订单对象包含了顾客的点菜信息。

订单类（Order）：

public class Order {
    private String customerName;
    private String dishName;

    public Order(String customerName, String dishName) {
        this.customerName = customerName;
        this.dishName = dishName;
    }

    public String getCustomerName() {
        return customerName;
    }

    public String getDishName() {
        return dishName;
    }
}

责任链模式：服务员、厨师和收银员

// 处理订单的接口
public interface OrderHandler {
    void handleOrder(Order order);
}

// 服务员
public class Waiter implements OrderHandler {
    private OrderHandler nextHandler;

    public Waiter(OrderHandler nextHandler) {
        this.nextHandler = nextHandler;
    }

    @Override
    public void handleOrder(Order order) {
        System.out.println("Waiter takes order from " + order.getCustomerName());
        if (nextHandler != null) {
            nextHandler.handleOrder(order);
        }
    }
}

// 厨师
public class Chef implements OrderHandler {
    private OrderHandler nextHandler;

    public Chef(OrderHandler nextHandler) {
        this.nextHandler = nextHandler;
    }

    @Override
    public void handleOrder(Order order) {
        System.out.println("Chef prepares dish: " + order.getDishName());
        if (nextHandler != null) {
            nextHandler.handleOrder(order);
        }
    }
}

// 收银员
public class Cashier implements OrderHandler {
    @Override
    public void handleOrder(Order order) {
        System.out.println("Cashier processes payment for " + order.getDishName());
    }
}

装饰者模式：为订单添加额外信息

// 装饰者抽象类
public abstract class OrderDecorator implements OrderHandler {
    protected OrderHandler nextHandler;

    public OrderDecorator(OrderHandler nextHandler) {
        this.nextHandler = nextHandler;
    }

    @Override
    public abstract void handleOrder(Order order);
}

// 装饰者：添加打包信息
public class PackagingDecorator extends OrderDecorator {
    public PackagingDecorator(OrderHandler nextHandler) {
        super(nextHandler);
    }

    @Override
    public void handleOrder(Order order) {
        System.out.println("Packaging decorator adds packaging for " + order.getDishName());
        if (nextHandler != null) {
            nextHandler.handleOrder(order);
        }
    }
}

客户端代码：

public class Client {
    public static void main(String[] args) {
        // 构建责任链：服务员 -> 厨师 -> 装饰者（打包） -> 收银员
        OrderHandler cashier = new Cashier();
        OrderHandler packagingDecorator = new PackagingDecorator(cashier);
        OrderHandler chef = new Chef(packagingDecorator);
        OrderHandler waiter = new Waiter(chef);

        // 创建订单
        Order order = new Order("John", "Pizza");

        // 提交订单给责任链
        waiter.handleOrder(order);
    }
}

在这个例子中，责任链模式帮助我们实现了订单处理的链式调用，而装饰者模式允许我们动态地为订单添加额外的信息（比如打包）。通过这样的设计，我们可以更容易地扩展系统、添加新的处理者或者装饰者，而不必修改现有的类。