版权声明:不自见故明;不自是故彰;不自伐故有功;不自矜故长; https://blog.csdn.net/LightUpHeaven/article/details/84895869
12.1梳理并分解继承体系(Tease Apart Inheritance)
12.2.将过程设计转化为对象设计(Convert Procedural Design to Objects)
12.3.将领域和表述/显示分离(Separate Domain from Presentation)
12.4提炼继承体系(Extract Hierarchy)