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C) Initial understanding of UML. This is a tool for learning design patterns. In the early days, you could even only know the relevant diagrams of BlueJ, which took 10 minutes.刘邦也很快察觉到项庄的用意，脸色不禁为变，心中盘算着如何躲避项庄的剑锋。金鹏王朝的遗臣青衣候带走了朝中珍宝，引得江湖人士纷纷蠢蠢欲动，想要将这件宝贝纳入囊中。陆小凤（林志颖 饰）、西门吹雪（李铭顺 饰）、欧阳情（陶虹 饰）和老实和尚（莫少聪 饰）等人亦被卷入其中。西门吹雪一生痴迷剑术，早已经修炼到了炉火纯青的境地，只希望能够高人现身，和自己一决高下。东洋剑太高手叶孤城（吴兴国 饰）的出现激起了西门吹雪的斗志，两人约定九月十五日于紫禁之巅决战。城中接二连三发生离奇命案，敏感的陆小凤感到这同西门吹雪和叶孤城之间的决斗有着千丝万缕的关联，于是一心想要阻止，并为此设下了环环相连的圈套。相反，对于明廷来说，苔湾就像是一只吸血鬼，虽然没有任何战争与劫掠，但无时不刻不在拼命吸食着内陆的人财物。北漂族张洋，因不满整天被领导骂，愤然辞职，决定与学长大崔创业，两人变卖了最后的家当，打造一款相亲APP。APP做好后，两人极尽可能挨家挨户的推广宣传，而一个月后，仍然一无所获，挫败的大崔和张洋发生争执，分道扬镳。倍感失落的张洋决定放弃，就在这时APP迎来了第一位有需求的会员张西西，项目经理，容貌未知，气质上乘。张洋为了留住会员，决定亲自赴约相亲，伴随着约会时间的临近，一场0元投资，1000000+收益的爱情游戏悄然开启。For the advantages we mentioned, the second point is that we can understand the virtual agent below. The virtual agent is used to control access to the ontology with high creation cost. It will postpone the instantiation of the ontology until a method is called. For example, if the instantiation of an object is very slow now, it cannot be completed immediately when the web page is loaded. We can create a virtual agent for it and let it postpone the instance of the object until it is needed.The difference between them is that each policy class in the policy mode is equal and parallel, and there is no connection between them. Therefore, customers must be familiar with the functions of these policy classes so that customers can actively switch algorithms at any time. However, in the state mode, the behavior corresponding to the state and the state has long been encapsulated, and the switching between states has long been stipulated to be completed. The "change of behavior" occurs within the state mode. For customers, they do not need to know these details. This is what state patterns do