In the subway, a girl besides me while I was waiting for next stop in the front of door. The girl seems want to get off too. She looks into the window on the door and trying to make herself look better. Arrived at the stop, the girl sudden…

将容易变化的代码放到一个模块里，或者一个方法里面，给这些代码一个接口。（方便修改） 将可替换的代码放到一个模块里，或者一个方法里面，给这些代码一个接口。（方便替换） 将可复用的代码放到一个模块，或者一个方法里面，给这些代码一个接口。（方便复…

This is the very first post of this blog.