public class Payment {

    //定义支付订单金额

    private Integer amount;

    //初始化一个新的支付实例

    public Payment(Integer amount) {

        this.amount = amount;

}

    //创建支付

    public void create(Integer amount){

        this.amount = amount;

    }

}

public class Merchant {

    public void associateOrder() {

        // 将订单与特定的商户关联

    }

}

public class Order {

    private Integer id;//订单ID

    private LocalDateTime time;//下单时间

    private Integer amount;//订单金额

    private Payment payment;// 来自类-关联属性可见性

Merchant merchant = new Merchant();

    // 构造函数，初始化订单的基本信息

    public Order(Integer id, LocalDateTime time, Integer amount) {

        this.id = id;

        this.time = time;

        this.amount = amount;

    }

    public void makePayment(Integer amount) {

        // 实现支付逻辑

        payment = new Payment(amount);

    }

    public void createOrder() {

        // 通过参数传递的Merchant对象间接关联商户与订单

        merchant.associateOrder();

    }

}

public class System {

    private Order order; // 来自类-关联属性可见性

    public void createOrder() {

      //创建订单

       order.createOrder();

    }

    public void confirmOrder() {

        // 确认订单

    }

}