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Understanding the Caching Agent:传奇的拉贝尔大陆藏着神秘圣灵力量，而得到力量的方法被记录在了花之法典之中并由众多花仙精灵王守护，传说中只有被承认的魔法使者才能唤醒力量，并使用它们战胜邪恶。 黑暗女王率领着邪恶军团为此向拉贝尔大陆开战，在普普拉花神和古灵仙族众多花仙的努力下，解救大陆的命运与一位地球少女捆绑在了一起。而夏安安为了妈妈也开始了收集...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).Note: If there is no saved rule, please be careful when deleting the rule再回东番，已是更盛的盛景。Ha Xuesheng, director of the program department of CCTV's financial channel, concluded: "Charming China City is a bold attempt by our CCTV financial channel. For such a long time, we are also looking for a new path for our own development. We need to look for areas of expertise, look for CCTV's value, social responsibility and responsibility, integrate social resources and do programs that CCTV cannot do. "Charming China City" has found an accurate positioning this time, combining with the government and tourism resources, and using the resource integration ability that others do not have, to realize the demand resonance for the transformation and upgrading of the city, and to realize the resonance between the social and urban transformation needs and the responsibility of our program. "既然说开了，那现在再认回去也不迟啊。