1.单一职责原则(SRP,Single Responsibility Principle)
2.开闭原则(OCP,Open Closed Principle)
3.里氏替换原则(LSP,Liskov Substitution Principle)
4.依赖倒置原则(DIP,Dependence Inversion Principle)
5.接口隔离原则(ISP,Interface Segregation Principle)
6.合成复用原则(CRP,Composite Reuse Principle)
7.原则七:迪米特原则(LOD,Law of Demeter)