OOP - interface segregation principle ISP 介面分離原則

用戶不應該被迫相依於他們用不到的函示

如果有用不到的函示，應該做成不同的 interface 或是 protocal

有要用到再裝上去就好

https://danielkjchen.wordpress.com/2016/02/05/%E7%89%A9%E4%BB%B6%E5%B0%8E%E5%90%91%E4%BB%8B%E9%9D%A2%E9%9A%94%E9%9B%A2%E5%8E%9F%E5%89%87-interface-segregation-principle/

http://ithelp.ithome.com.tw/articles/10101106