OO Design Principles（OO设计原则）: SOLID

(SRP)  The Single Responsibility Principle 单一责任原则   (OCP) The Open-Closed Principle 开放-封闭原则  (LSP)  The Liskov Substitution Principle Liskov替换原则  (ISP)   The Interface Segregation Principle 接口聚合原则 (DI

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