Architecture_01
First share a wave, some videos of the open class:
Link: https://yun.baidu.com/s/1c1K7f6C Password: a3vp
If you are interested, you can study the content of the open class first. It is quite good, although there is a lot of time for advertising.
Design Patterns
Six principles of design patterns
Open-Closed Principle (General)
对扩展开放，对修改封闭
Interface Segregation Principle
每个接口中不存在子类用不到却必须实现的方法，如果不然，就要将接口拆分。
Dependency Inversion Principle
面向接口编程，依赖于抽象而不依赖于具体任何基类可以出现的地方，子类一定可以出现。
Demeter's Principle (Least Knowing Principle)
一个类对自己依赖的类知道的越少越好。只与直接的朋友通信。
Single Responsibility Principle
每个类应该实现单一的职责
Liskov Substitution Principle
任何基类可以出现的地方，子类一定可以出现。
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