设计模式开闭原则（OCP）
开闭原则英文全称是Open-Closed Principle，常缩写为OCP。"开-闭"原则讲的是：一个软件实体应当对扩展开放，对修改关闭。这一原则最早是由Bertrand Meyer[MEYER88]提出，英文原文是：Software entities should be open for extension, but closed for modification.
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