代理模式实例订单系统

悠悠 2023-10-07 12:05 28阅读 0赞

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  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzE1NzE5NjEz_size_16_color_FFFFFF_t_70]  
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);
    
    	}
    
    }

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