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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?"说实在话。到时候我一杯酒也不喝。Public void notifyObservers ();二十世纪八十年代中期，古都北京在改革开放的大潮中一派繁荣景象。 新中国第一批红领巾梁若岚，闵湘珠，冯如珠，冯如乾，钱三立，侯乐天，娄英甲，谷之枫，潘越等人如今已。民国，宁城巡捕房接到报案，梁氏商贸公司总经理梁春死在了婚床上。巡捕房的探长伍士德，通过对梁春和惠美童年时期的调查，发现梁春的性刺激使惠美在新婚一大早又一次出现‘晨间僵死’症状。梁春醒过来看到这一现象，以为妻子暴死，童年时被父亲强迫吃生猪肉的经历在他的心灵形成很深的创伤，造成精神上的自我强迫症。大学时吃人体标本事件，又进一步加深了他的病症。所以新婚妻子赤裸的‘尸体’才会给他极其强烈的惊吓冲击，以致气绝身亡。而惠美醒来后看到丈夫暴毙，本来就非常脆弱的心灵根本无法承受这样的现实，就在潜意识里强迫自己遗忘眼前的一切，也就是间歇性失忆，她在无意识的情况下穿上睡衣，离开了新房……“在艰弥厉、战斗到底”，这一句正是潮州人的座右铭！然而，当一个已经疏远你多年的父亲突然离世，而他又将接班人的重任委托于你，你该如何应对？人称“坤叔”的郑坤本是香港巨贾。一晚，郑坤于家中暴毙，其死后，集团变得动荡不已。任谁都没有料到，郑坤已于生前立下遗嘱：将公司一切业务，交予自己疏远多年的幼子郑森。