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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?"Test Output:Netflix宣布其首部自家制片的多镜头新喜剧﹑以青少年为目标的《Alexa & Katie》13集首季于美国时间3月23日上线，该喜剧由Paris Berelc及Isabel May主演。《Alexa & Katie》由Heather Wordham主创﹑Matthew Carlson负责制片，讲述两个长年好友Alexa（Paris Berelc）及Katie（Isabel May），她们正热切期待成为高校新生，但一些风波弄得她们自觉成了圈外人，然而重要的是好友还在身边。Alexa目前正在接受化疗，但这没动摇她外向的性格及对生活的热情，而Katie是个忠于朋友﹑性格古怪的可爱女生。Disadvantages: There are a little more node objects in the responsibility chain mode. It is possible that most nodes do not play a substantial role in a certain request process. Their role is only to makeThe heel is thickened, which can increase the buffer when landing to a certain extent during movement, thus reducing the reaction force.两年不见高易和陆明、周大三人孤身在此，帮自己打理山yīn封地。One-day subway ticket, 740 yen for adults and 370 yen for children, can take Nagoya subway at will on the same day.