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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."影片改编自阿加莎·克里斯蒂的同名小说，将故事背景搬到了现代。讲述了一起发生在火车上的谋杀案。表四少爷青莲和表姑娘紫茄也都还没成亲……随着他们的述说，孙鬼在旁进一步解释，比如玄武王妃的爷爷就是在清南村教了许多年书的周夫子。深爱着的丈夫忽然带回来一个私生子，未及解释却遭人谋杀。在寻找元凶和面对孩子的过程中，女主人公将要面对怎样的人生？在这个故事中，观众看到的是一个深受打击的女人是如何用一颗善良的心坚强面对生活的磨难，并给他人带来生活的希望的。　　卧底探员陈凤翔（陈小春 饰）在破获一宗社团大案之后，转任文职八年被反黑组重新招回。由于江湖上最令人头痛的黑社会头目正是陈凤翔当年的小弟张志强，陈重出“江湖”，加入以张少钧（陈国坤 饰）为首的反黑B1-1组与新晋恶棍展开周旋，其中不乏昔日好友与仇家，令陈一度进退两难，好在陈与队友在合作期间培养出互信默契。正值香港回归还有三年，黑帮打算乘势大干一票。陈在调查一宗龙头棍的失踪案件时，却发现了涉及香港黑社会百年历史的惊天大阴谋。他当时听了太后要赐婚的话，可是吓了一跳，急忙阻止，并说明缘故，言明皇家只能出力，不能出头，再不想揽事上身了。The above hope can help you.