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OCP (Open-Closed Principle) principle emphasizes that a software entity (class, function, module, etc.) should be open to extension and closed to modification. That is, every time there is a change, the behavior of the existing type should be enhanced by adding new code instead of modifying the original code.一路无话，回到刘家，刘三顺对刘大胖子道：爹，这门亲还是算了吧。To change these settings, exit the flight simulator and press Ctrl + Alt + A (+ Option + A on the Mac)虽说无招却是以普天下剑法之招数为根基，因而其变化之多端不逊于总决式。杨长帆愈发意识到，要做的事太多了，自己这辈子是不可能做完的。该剧围绕四个家庭，讲述了家庭成员迎着阳光风雨努力奋斗，最终收获成长的故事。Let's first list a column in life to illustrate the following command mode: For example, we often buy things on Tmall. Then place an order, I want to receive the goods after placing the order, and hope that the goods are true. For users, it is not concerned about how the seller delivers the goods after placing the order. Of course, the seller also has time to deliver the goods, such as delivering the goods within 24 hours. Users do not care about who the express delivery is to, and of course some people will care about what the express delivery is. For users, it is only necessary to deliver the goods within the specified time and generally receive the goods within a considerable time. Of course, the command mode also includes cancellation orders and redo orders. For example, after we place an order, I suddenly don't want to buy it. I can cancel the order or place the order again (i.e. Redo the order) before delivery. For example, I took the wrong size of my clothes. I cancelled the order and took a larger size again.