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);

	}

}