【Static proxy】

先看一个类：Thread

• 接口类Runnable：
  
• Thread 类实现了 Runnable
  
• 有一个Runnable的成员变量
  
• Constructor can be passedRunnable
  
• 实现Runnable的run方法,调用成员变量的run：
  

This is a static proxy.

Now implement a simple static proxy：

• There is an interface for cooking
• Chef implements the cooking interface
• Now want to do something before and after the chef cooks（It is equivalent to enhancing the chef's cooking method）
  • Define a restaurant interface
  • Prepare the ingredients before the chef cooks
  • The food is served to the user after the chef has cooked it

具体代码如下：

public class Tests {
    
    public static void main(String[] args) {
    
        Hotel hotel = new Hotel(new Chef());
        hotel.cook();
    }
}

//做饭
interface Cooking {
    
    void cook();
}

//厨师,just cook
class Chef implements Cooking {
    
    @Override
    public void cook() {
    
        System.out.println("Chef 正在做饭...");
    }
}

//饭店,准备食材、厨师做饭、Provide food to customers
class Hotel implements Cooking {
    
    private Cooking cooking;

	//The constructor passes in the interface object
    public Hotel(Cooking cooking) {
    
        this.cooking = cooking;
    }

    @Override
    public void cook() {
    
    	//Enhancements to interface object methods
        System.out.println("Hotel准备食材");
        
        cooking.cook();
        
        System.out.println("HotelProvide products to users");
    }
}