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After 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?"当年扶苏之死天下皆知，你也以为是老夫贪恋权位，利令智昏所致？历史确实是这样记载的，尹旭轻轻点点头，旋即心头一震，回味出李斯话里的不同意味，试探着问道：外公，莫非其中有什么别的隐情？李斯仰天长叹一声，沉默许久才幽幽叹道：已经过去好多年了，当事人也全都故去了，即便老夫说出来你又有几个人相信呢？尹旭心念一动，看来其中还真有什么别的缘故。-Mast lights, 5 nautical miles, but ships less than 20m in length, 3 nautical miles:陈启走到角落，接通电话。Forty-seventh fire technical service institutions in violation of these Provisions, one of the following circumstances, shall be ordered to make corrections, fined 10 thousand yuan to 20 thousand yuan:Don't sink, don't sink, the little cute with the wrong number of buildings can dd me for a moment, and I'll see if they have been swallowed.(2) Market segmentation: In the "era of concentration", product spokesmen should also be detailed and spokesmen should be subdivided. Including the breakdown of gender, age, personality, nationality, etc. Different regions have different concepts, consumption patterns, consumption concepts, economic and cultural backgrounds and aesthetic methods. Stars have different influence in different regions.