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是朕不问情由，好心办了坏事。尹旭勒马翻身跳了下来，便见到一个俊俏的美人儿奔了出来，站在自己的面前。　　什么原因、为什么、谁杀了他？在事件发生后，她们彼此产生心结，再加上各自的爱情和烦恼，把彼此綑绑在一起，过程令人窒息。《幸福保卫战》海报(3张)Qinghai ProvinceThe purpose of visitor mode is to separate processing from data structure. Many systems can be separated according to algorithm and data structure. If such systems have relatively stable data structure, they are easy toThe execution results are consistent with the previous code, but the benefits of using the state mode are obvious. It can localize the relationship between each state and its corresponding behaviors, which are scattered and encapsulated in their corresponding state classes, making it easy to read and manage the code. In addition, the switching between states is distributed within the state class, which makes it unnecessary to write too many if, else conditional branch languages to control the switching between states.