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So far, a simple file upload program has been written. Of course, this is still a counterexample. The disadvantage here is the same as the first code in the light example. The program is full of if and else conditional branches. The state and behavior are coupled in a huge method. It is difficult to modify and extend this state machine. This problem is exacerbated by the complexity of the links between file statesWhich patients should have MDT discussion (take tumor MDT as an example, In principle, MDT discussions should be conducted for all tumor cases diagnosed for the first time, all retrospective cases after the first treatment, all cases that are not suitable for standardized treatment procedures, all recurrent cases, difficult and complicated cases, etc. However, for a certain MDT meeting, the number of cases discussed should be determined according to the MDT meeting time)Prunus dulcis almond明显的虚张声势，这不是敌人的根本目的，那么……左明后背冷汗直流，在寒冷的冬夜里，一片冰凉。Memory shutdown!这套剧集展现了大量前沿尖端的高科技侦破技术：弹道学、犯罪危险因子学、法医毒理学、DNA破裂鉴定、咬痕与血型分析、齿科学、痕迹学、犯罪变态心理学等，因此掀起了全球“法医学热潮。In the previous example of electric lights, a state mode program was completed. First, the Light class is defined, which is also called Context here. Then in Light's constructor, to create instance objects for each state class, Context will hold references to these state objects in order to delegate the request to the state objects. The user's request, that is, the action of clicking button, is also implemented in Context, with the following code: