Part3. DESIGN PRINCIPLES 设计原则Chap7. SRP: THE SINGLE RESPONSIBILITY PRINCIPLE SRP:单一职责原则Chap8. OCP: THE OPEN-CLOSED PRINCIPLE OCP:开闭原则Chap9. LSP: THE LISKOV SUBSTITUTION PRINCIPLE LSP:里氏替换原则Chap10. ISP: THE INTERFACE SEGREGATION PRINCIPLE ISP:接口隔离原则Chap11. DIP: THE DEPENDENCY INVERSION PRINCIPLE DIP:依赖反转原则