Remember that the reason for adopting OO habits is to carefully encapsulate change so your code is more extensible and maintainable.
记住采用OO习惯的原因是要谨慎封装更改，这样代码将更具有可扩展性并且更容易维护。
Martin Fowler: the reason you do planned design is because you think it's too hard to change the code.
马丁：你之所以采用计划型设计，是因为你认为改动代码是件很麻烦的事情。
Martin Fowler: the reason you do planned design is because you think it's too hard to change the code.
马丁：你之所以采用计划型设计，是因为你认为改动代码是件很麻烦的事情。
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