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Advantages: Adding a new operation is easy, because adding a new operation means adding a new visitor, and the visitor pattern centralizes the relevant behaviors into a visitor object.『夜叉』是改编自深受欢迎的日本漫画家-吉田秋生之最新原作。主角有末静是位遗传基因受改良，无论在体能、智能的发展都相当惊人的天才。受聘于美国某着名科学研究所。故事的展开从有末静为了调查一桩发生在日本某小岛的病毒感染事件，来到日本开始。龄化问题及生化科技等国际性热门话题；其间并交织主角有末静与其双胞胎弟弟的爱恨情仇。除了故事内容，本剧的映像画面也深受注目。想知道运动神经及身体能量异于常人三倍的有末静，将如何表现其过人之处？而最新人气偶象伊藤英明如又如何展现其精湛演技？韩信笑道：井陉口传来消息，赵国大军纷纷走出营寨，在山口之外布阵准备和我们正面作战。板栗微微一笑道：真是多谢张老哥了。在复生的帮助下，张俊也顺利进入到了丰乐楼。三人的感情逐渐加深，球艺也每日俱进。这时，号称复生未婚妻的宝珠（王嘉悦 饰）却杀到了丰乐楼……一个巨大的包围网终于到了收网的时候，俞大猷所料的生死线一丈不多，一丈不少，倭人未到，箭雨已至。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).