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Attack Power UP [Small] 5The command mode is well understood. For example, the commander ordered the soldiers to do something. From the perspective of the whole thing, the commander's role is to issue a password, which is transmitted to the soldiers' ears and executed by the soldiers. Fortunately, the three are decoupled from each other. Neither side needs to rely on others, but only needs to do its own thing. The commander wants the result and will not pay attention to how the soldiers achieve it. Let's look at the diagram:1 无视游戏钓鱼不仅仅是爱好，更是一种执念，驱使我们涉足地球上一些最偏远最狂野最危险的地方。由四次元单纯恶女打工妹和呆萌的暖男店长以便利店为背景展开的24小时无法预测浪漫喜剧电影开始，仅仅几分钟，已经完全勾勒出江湖的危险残酷，刻画出东方不败的凶残霸道。For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.