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The specific implementation is as follows:Memory = new Memory ();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).System.out.println ("build the tree finished! ");　　《小主起来嗨》将首度聚焦自媒体——网络主播，通过励志，惊悚，歌舞，黑帮，青春，漫画等多变画风的自由转换，围绕“生活就是秀场，人生各自精彩”这一主题，打造一部爆笑网络喜剧。The crossroads of life are full of seemingly small but actually key choices. Deliberate choices determine the success or failure of life. You should have drunk enough chicken soup for the soul and listened to enough success stories. The book "Deliberate Choice" is like a pair of noise-reducing headphones, which has helped you block suggestions that seem correct but have no practical value. This is an easy and easy-to-read inspirational book, which aims to guide readers to break through habitual thinking and change their work, life and social life from deliberately choosing different behaviors. Best-selling writer Rocht Balgava provides 15 simple, practical and easy-to-operate life algorithms in his book to help you successfully break through the dilemma of life. So, how do you start? Of course, let's learn to eat with our left hand first!