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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."Perhaps you have heard the DFU mode of iPhone. The full name of DFU is Development Firmware Upgrade, which actually means the forced upgrade and downgrade mode of iPhone firmware. For example, if there is an error (1) or error (6) when you downgrade the firmware of the iPhone, then when you restore or downgrade the firmware, you need to put your iPhone into DFU mode to completely downgrade.AbemaTV開局2周年記念オリジナル連続ドラマ「会社は学校じゃねぇんだよ」にて、三浦翔平が連続ドラマ初主演を果たすとわかった。启明影视的下一部电视剧已经定了下来，准备以杨露禅为主角，拍摄出一部真正关于国术太极拳的电视剧。　　秦国，赫赫有名的秦昭襄王寿终正寝，重病中的太子安国君即位称王，并立庶出的公子异人为太子，出身楚国王族的王后华阳夫人执掌了国政大权。她也是异人的嫡母。英剧《只身孤影(暂译)\Joe All Alone》讲述了Joe的妈妈和她的男友外出旅行，让Joe在家里独自生活。妈妈的男友警告他不许出门，不许让陌生人进家门。在他独处的过程中，他结识到了他的邻居Asha，同时意外地发现了家里藏了一大笔钱....