Implementation steps:
1. Create an interface, define a method, and express what the target and agent need to do.
package com.itweiting.service;
public interface ThreeSquirrelSell {
//定义方法 参数amount表示一次购买的数量
//返回值表示优盘的价格
float sell(int amount);
//可以定义多个方法
}
2. Create the target class and implement the interface
package com.itweiting.factory;
import com.itweiting.service.ThreeSquirrelSell;
public class ThreeSquirrelFactory implements ThreeSquirrelSell{
//目标类，厂家，厂家不接受用户的单独购买
public float sell(int amount) {
//一包零食的价格
//后期根据amount数量进行调整价格,例如一箱零食100元，买两箱零食每箱90元
return 100.0f;
}
}
3. Create an agent and implement an interface (enhanced functions are realized)
package com.itweiting.shangjia;
import com.itweiting.factory.ThreeSquirrelFactory;
import com.itweiting.service.ThreeSquirrelSell;
//淘宝进行代理销售,
public class Taobao implements ThreeSquirrelSell {
//声明商家代理的厂家是谁
private ThreeSquirrelFactory factory=new ThreeSquirrelFactory();
//实现销售的功能
public float sell(int amount) {
//向厂家发送订单，提醒厂家进行发货
float price = factory.sell(amount);
/*功能增强*/
//商家进行加价，（即代理进行后期的加价）
//代理类完成了目标类的方法调用后增加了其他功能（比如增减价格）
price = price+25;
//优惠
System.out.println(price-20);
//返回增加价格后的商品价格
return price;
}
}
4. Create a client class and call the agent to perform an operation.
package com.itweiting;
import com.itweiting.shangjia.Taobao;
public class ShopMain {
public static void main(String[] args) {
//创建淘宝的代理对象
Taobao taobao =new Taobao();
float price=taobao.sell(1);
System.out.println(price);
}
}