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The following procedure is to use the state mode to improve the light. When it comes to encapsulation, the behavior of the encapsulated object is generally preferred over the state of the object. But the opposite is true in state mode, The key to the state mode is to encapsulate each state of the thing into a separate class, and the behaviors related to this state are encapsulated inside this class, so when button is pressed, only the request needs to be delegated to the current state object in the context, and the state object will be responsible for rendering its own behaviors. At the same time, the state switching rules can be distributed in the state classes in advance, thus effectively eliminating a large number of conditional branch statements that originally existed.郑家一片混乱，嚎哭声震天。Attackers can use small packets (64 bytes) and large packets (more than 1500 bytes) to attack.以此为契机，这两个性格有些古怪却灵巧可爱的女孩开始了她们伟大的友谊……You are also welcome to ask questionsAfter understanding the history and classification of design patterns, how should we learn design patterns? Before learning the design pattern, readers must establish a kind of consciousness, that is, the design pattern is not only a method and technology, but also an idea and a methodology. It has nothing to do with the specific language. The main purpose of learning design patterns is to establish object-oriented ideas, program to the interface as much as possible, with low coupling and high cohesion, so that the programs you design can be reused as much as possible. "Specious. Learning design patterns can better understand object-oriented ideas. Design patterns are some design skills and tricks. Don't rise to ideas and methodologies, okay?"After graduating from college, I have been very interested in using mathematical methods to write programs to solve problems. At the same time, I also keep reading all kinds of books and papers on computer science, and I am lucky to catch up with the upsurge of machine learning and in-depth learning that has arisen in the past ten years.