# solid原则

S.O.L.I.D是面向对象设计和编程(OOD\&OOP)中几个重要编码原则(Programming Priciple)的首字母缩写。

| **SRP** | [The Single Responsibility Principle](http://www.objectmentor.com/resources/articles/srp.pdf) | 单一责任原则 |
| ------- | --------------------------------------------------------------------------------------------- | ------ |
| **OCP** | [The Open Closed Principle](http://www.objectmentor.com/resources/articles/ocp.pdf)           | 开放封闭原则 |
| **LSP** | [The Liskov Substitution Principle](http://www.objectmentor.com/resources/articles/lsp.pdf)   | 里氏替换原则 |
| **ISP** | [The Interface Segregation Principle](http://www.objectmentor.com/resources/articles/isp.pdf) | 接口分离原则 |
| **DIP** | [The Dependency Inversion Principle](http://www.objectmentor.com/resources/articles/dip.pdf)  | 依赖倒置原则 |

总结：

1. 一个对象只承担一种责任，所有服务接口只通过它来执行这种任务。
2. 程序实体，比如类和对象，向扩展行为开放，向修改行为关闭。
3. 子类应该可以用来替代它所继承的类。
4. 一个类对另一个类的依赖应该限制在最小化的接口上。
5. 依赖抽象层(接口)，而不是具体类。

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