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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?"该剧讲述走马上任的江南县委书记严东雷带领班子成员，坚持人民利益至上的群众观，在优化发展环境、加强党的基层组织建设、开展效能革命、推进生态文明建设等一系列工作中的故事。Create multiple product objects in multiple product families. Q: How? A: Each specific factory creates multiple product objects in a product family, and multiple specific factories can create multiple objects in multiple product families.自己坐在河边看日落，倚靠在温暖厚实的肩膀上……曾经无数次想要回头看清楚那个肩膀主人的面庞，却始终一片茫然……每每想到这，她总会忍不住头疼。The probability of understanding can be improved through many skills, or through the weapon's own understanding, the weapon's customized enhancement, and the cat or teammate playing the flute (15%)张经、周琉、曹邦辅三位功勋先后走人，这无疑寒了全军将士的心。不一会。