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故事围绕一名杀手在最后一次任务中，陷入了困境。The code for creating the object is encapsulated and the specific factory class is instantiated, thus achieving the purpose of encapsulation and instantiation. Encapsulating the code that creates the object in one place can also achieve the purpose of reuse and is more convenient for later maintenance. This also means that when the customer instantiates the object, he will only rely on the interface and not on the specific implementation. Help us to better achieve interface programming rather than implementation, making the code more flexible to cope with future extensions.(a) Hold my valid medical security certificate to see a doctor, purchase drugs and take the initiative to show for examination, shall not rent (lend) my valid medical security certificate to others;Summarize a few points to deal with for the head of the agency website: at that time, those who show short-term business losses will stabilize the customers first: "Kiss you, don't worry, don't worry, oh, I will definitely help you make up for your business."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:Sometimes, we joke, "My first child is a son and my second child is his father." How much helplessness is contained in this self-blackened joke.《居家男人》是一部前卫的动作剧，讲述的是一个在国家调查局特别小组工作的中产阶级男人的故事。当他试图保护国家免受恐怖分子的袭击时，他还必须保护他的家人免受他那秘密的、高压力的、低报酬的工作的影响。