代理模式实例订单系统

一旦订单被创建，只有订单的创建人才可以修改订单中的数
据，其他人则不能修改。
三个属性：产品名称、订购数量、订购人

成员接口

package daili;

public interface OrderApi {
    public String getProductName();

    public void setProductName(String productName, String user);

    public int getOrderNum();

    public void setOrderNum(int orderNum,String user);
    public String getOrderUser();

    public void setOrderUser(String orderUser, String user);

}

Order

package daili;

public class Order implements OrderApi {
    private String productName;
    private int orderNum;
    private String orderUser;
    
    public Order(String productName, int orderNum, String orderUser) {
        this.productName = productName;
        this.orderNum = orderNum;
        this.orderUser = orderUser;
    }

    public Order() {}

    @Override
    public String getProductName() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void setProductName(String productName, String user) {
        // TODO Auto-generated method stub

    }

    @Override
    public int getOrderNum() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public void setOrderNum(int orderNum, String user) {
        // TODO Auto-generated method stub

    }

    @Override
    public String getOrderUser() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void setOrderUser(String orderUser, String user) {
        // TODO Auto-generated method stub

    }

}

OrderProxy

package daili;

public class OrderProxy implements OrderApi {
    private Order order=null;
    
    public OrderProxy(Order order) {
        this.order = order;
    }

    @Override
    public String getProductName() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void setProductName(String productName, String user) {
        if(user!=null && user.equals(this.getOrderUser()))
            {order.setProductName(productName, user);
            }else {
        System.out.println("对不起"+user+", 您无权修改订单中的产品名称");
            }
    }

    @Override
    public int getOrderNum() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public void setOrderNum(int orderNum, String user) {
        if(user!=null && user.equals(this.getOrderUser())) {

                order.setOrderNum(orderNum, user);
        }else {
                System.out.println("对不起" +user+",您无权修改订单中的订购数量");
        }
    }

    @Override
    public String getOrderUser() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void setOrderUser(String orderUser, String user) {
        if(user!=null && user.equals(this.getOrderUser())) {

            order.setOrderUser(orderUser, user);
    }else {
            System.out.println("对不起" +user+",您无权修改订单中的订购人");
    }
}

    }

测试

package daili;

public class test {

    public static void main(String[] args) {
        OrderApi order=new OrderProxy(new Order("设计模式",100," 张三 ="));
        order. setOrderNum(123, "李四");

        System.out.println("李四修改后订单记录没有变化: "+order);
        order.setOrderNum(123,"张三");

        System.out.println("张三修改后订单记录: "+order);

    }

}