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Update README.md
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README.md

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1. 单一职责:一个类只做一件事
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2. 开闭原则:对扩展开放对修改关闭
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3. 里氏替换:之类必须能替换所有父类的使用
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3. 里氏替换:子类必须能替换所有父类的使用
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4. 依赖倒置:设计依赖于抽象而不是实现
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5. 最少知识:对象应当尽可能少的去了解其他对象
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6. 接口隔离:接口倾向于小而多

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