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In fact, each design pattern is a very important idea, which looks very familiar. In fact, it is because what we have learned is involved. Although sometimes we don't know it, it is actually reflected everywhere in Java's own design, such as AWT, JDBC, collection class, IO pipeline or Web framework, in which design patterns are everywhere. Because of our limited space, it is difficult to talk about every design pattern in great detail, but I will try my best to write down the meaning clearly in the limited space and space so as to make everyone understand better. If there is no accident in this chapter, it should be the last talk of the design pattern. First of all, it should be the figure at the beginning of the previous article:NBA game lasts 48 minutes and consists of 4 quarters with 12 minutes each.Residents! Let's unite and act! Let's learn from Ningbo Zhenhai people! Learn from them to pull back the government's more than 50 billion major petrochemical projects from the brink! Let's firmly demand the relocation of the Green Energy Waste Incineration Plant for ourselves, for the sake of our families and for the sake of future generations, and firmly oppose the expansion of the second phase of the Green Energy Waste Incineration Plant!Since the single mode is instantiated only once, the first call returns an instance object of a. When we continue to call, the instance of b is the instance of a, so aa is printed below.你老家人少么？妮哈摇头。西汉中叶，雄踞北方的游牧民族匈奴陷入了连年内乱之中，本已岌岌可危的胡汉关系又一次面临着历史的抉择。匈奴杰出的首领呼韩邪单于，为了匈奴的统一，审时度势，决意与汉朝盟好。而他的哥哥呼屠吾斯受一心追求权势的颛渠阏氏蛊惑，冥顽不化，坚持与汉朝为敌，兄弟俩不得不分道扬镳。与此同时，汉朝内部围绕着皇权的斗争，在胡汉关系上，也表现出截然不同的态度。一时间天下动荡，危机四伏。萌新小厨娘