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head-first-design-pattern's Introduction

OO 基础

  • 抽象
  • 封装
  • 多态
  • 继承

OO 原则

  • 封装变化
  • 多用组合,少用继承
  • 针对接口编程,不针对实现编程

设计原则

  • 找出应用中可能需要变化之处,把它们独立出来,不要和那些不需要变化的代码混在一起；
  • 针对接口编程,而不是针对实现编程；
  • 多用组合,少用继承；
  • 为交互对象之间的松耦合设计而努力；
  • 依赖倒置原则：要依赖抽象，不要依赖具体类；
  • 最少知识原则：只和你的密友谈话；
  • 好莱坞原则：别调用（打电话给）我们，我们会调用（打电话给）你
    • 我们告诉子类，"不要调用我们，我们会调用你"
  • 一个类应该只有一个引起变化的原因；

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