#### **1.单一职责原则（SRP Single Responseibility Principle）** #### **2.里氏替换原则(Liskov Substitution Principle)** #### **3.依赖倒置原则(Dependence Inversion Principle)** #### **4.接口隔离原则(Interface Segregation Principle)** #### **5.迪米特法则(Law of Demeter)** #### **6.开闭原则(Open Closed Principle)**