模板方法模式

  模板方法模式：

---

1. 购物 (抽象类)

package com.monkey1024.service;

public abstract class Shopping {
    
    // 模板方法
        public void buyGoods() {
            userLogin();
            buy();
            pay();
        }

        // 子类不能重写的方法
        public final void userLogin() {
            System.out.println("用户登录");
        }
        
        // 子类必须实现
        public abstract void buy();
        
        // 钩子方法
        public void pay() {
            System.out.println("使用银联卡支付");
        }
    }
    
    

2. 买衣服

package com.monkey1024.service;

// 购买衣服
public class ClothesShopping extends Shopping {

     @Override
    public void buy() {
         System.out.println("购买阿迪达斯_秋裤一条！");
    }
    
}

3.买鞋

package com.monkey1024.service;

// 买鞋子
public class ShoesShopping extends Shopping {

    @Override
    public void buy() {
        System.out.println("购买回力_足球鞋一双!!!");

    }

    @Override
    public void pay() {
         System.out.println("使用现金支付");
    }
    
    
    

}

4. 测试类

package com.monkey1024.test;

import com.monkey1024.service.ClothesShopping;
import com.monkey1024.service.ShoesShopping;
import com.monkey1024.service.Shopping;

public class MyTest {

    public static void main(String[] args) {
        
        // 买鞋
        Shopping shoesShopping= new ShoesShopping();
        shoesShopping.buyGoods();
15         System.out.println();
        // 买衣服
        Shopping clothesShopping= new ClothesShopping();
        clothesShopping.buyGoods();
20         
    }
}

运行结果：

用户登录
购买回力_足球鞋一双!!!
使用现金支付

用户登录
购买阿迪达斯_秋裤一条！
使用银联卡支付

---