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Therefore, learning design patterns, The first thing to do is to understand which aspects of design patterns are available to developers, Then, the principle, timing and method of each design pattern are studied respectively, that is to say, under what circumstances should a certain design pattern be used? When understanding the timing of a certain design pattern, it is also necessary to understand what consequences will be caused if this design pattern is not used at this time. After understanding the principle and usage of each pattern, more importantly, learning the object-oriented thinking mode, after mastering the object-oriented thinking mode, looking back at the design pattern, you will have a deeper understanding. Finally, learning the design pattern, you must study hard and practice more. "I agree with the last sentence very much."先不说这个，你滚回去问他，要不要侄女？本将军只给他一个时辰考虑。他发泄似的在路上狂奔，结果失足摔了下去.等他清醒过来发现自己已经来到了一个全然陌生的地方，周围的人们也诧异的看着他.If you have any other questions, please ask.你们也小么？家里那么多东西，非单吃一样？非一天吃许多？就不晓得分开吃？黄瓜斯斯文文地坐在姐妹们中间，帮着挑枣子。却见海瑞神色温和，冲左右道：谢谢大家，刚刚的英勇，我会如实报告与知府。　　The 4 different poles — Nick (Pon), Wan (Mo), Beam (Patricia), and Wayu (Godt) — continuously circle around each other, repeatedly clashing and burning in the fire of the collision.