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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.哼，要是进了王府，没准什么时候就出个意外。　　墨菲（波伊德·霍布鲁克 Boyd Holbrook 饰）是美国缉毒局派往哥伦比亚的警探，他和搭档潘那（佩德罗·帕斯卡 Pedro Pascal 饰）合作，主要负责埃斯科瓦尔的案件。埃斯科瓦尔当上了议员，甚至决心竞选总统，却在国会当众受辱。之后，哥伦比亚政府试图启用引渡法案对付毒枭们，为了对抗政府，埃斯科瓦尔彻底沦为了反社会的恐怖分子，在不断壮大自己的毒品帝国的同时，用炸弹、暗杀和鲜血提醒着哥伦比亚政府，谁才是真正的老大。C. Figure skating: single skating, double skating and ice dancing.In fact, each design pattern is a very important idea, which looks very familiar. In fact, it is because what we have learned is involved. Although sometimes we don't know it, it is actually reflected everywhere in Java's own design, such as AWT, JDBC, collection class, IO pipeline or Web framework, in which design patterns are everywhere. Because of our limited space, it is difficult to talk about every design pattern in great detail, but I will try my best to write down the meaning clearly in the limited space and space so as to make everyone understand better. If there is no accident in this chapter, it should be the last talk of the design pattern. First of all, it should be the figure at the beginning of the previous article:静电超强力？午饭变酸了！没想到这个世界除了有烦恼星人，还有麻烦分子！麻烦分子比烦恼星人还小，小到肉眼看不见，超迷你战士必须把自己缩小到千分之一，才能进入纳米世界打击新形态的敌人；麻烦分子看起来天真无辜，却能对人类世界造成极大的麻烦，到底它们从何而来，又有什么目的呢？快呼叫超迷你战士，打败你的麻烦！