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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?"Skin patterns are designed to resolve dependencies between classes and class homes, Like spring, the relationship between classes can be configured into the configuration file, while the appearance mode is to put their relationship in a Facade class, which reduces the coupling degree between classes. There is no interface involved in this mode. Look at the following class diagram: (Let's take the startup process of a computer as an example)Weaving)　　监製Jazz透露：同盟「虽然有部份城寨演员参与，但故事是截然不同。今次会找来鲍起静（鲍姐）做『武则天』，在剧中管天下，而剧情讲到现代世界的角力，还有一些神秘情节，主要围绕陈展鹏、胡定欣、陈山聪、姚子羚之间的竞争。《流星》讲述为了让如夜空中星星般的艺人们发光发亮，在背后流血、流泪、流汗的人们的故事。棘原的中军大帐里，章邯听到报告后脸色阴沉到了极点。嬴子夜有些愕然地看着尹旭，诧异道：依兰姐都把断水赠送与你，怎么？你对她全无了解？尹旭摇头哂道：哪里，赠送断水与我，是为了答谢彭蠡泽救命之恩。