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又是那套冠冕堂皇的话。改编自Robyn Carr浪漫小说的Netflix集新剧《#维琴河# Virgin River》尚未有上线日期，就已获续订10集第二季。1911年，古老的华夏大地迎来了最重要的时刻，辛亥革命掀开了历史的新篇章，然而却有袁世凯（梁冠华饰）倒行逆施，攫取革命胜利果实。为了肃正视听，袁更刺杀了国民党政治领袖宋教仁。随后，袁在二次革命中挫败孙中山和黄兴，终于成为了独掌大权的大总统。与此同时，为了网络民心，袁世凯宣云南都督蔡锷（王志飞饰）赴京上任。胸怀救国救民理想的蔡锷却未想到自己落入了危机四伏的政治泥潭：袁世凯对其且用且防；段琪瑞（陈逸桓饰）磨刀霍霍、步步紧逼；袁克定（李帅饰）则如幽灵一般监视着他的一举一动。看似若不经风的蔡锷，势将担起拯救中华的重任……? Singleton pattern is the most common and simplest design pattern in design pattern, which ensures that only one instance exists in the program and can be accessed globally. For example, account information object management used in actual APP development? Objects (SQLiteOpenHelper) and so on all use singleton mode. This model has several advantages:　 一群曾被宣判为“再也不是军人”的囚犯，在监狱里，要证明自己依然能像勇敢的士兵那样战……B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).