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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:Command cmd = new MyCommand (receiver);我直接指点，你不一定信服，要自己想。　　故事聚焦新时代女性成长，通过讲述家境不同，性格不同，但从校园时期就拥有少女情谊的蒋南孙与朱锁锁，一同经历亲情、爱情、事业、婚姻种种考验，仍旧互相扶持，同甘共苦的故事，深度呈现现代女性生活现状与成长困境，深化对现实的思考和感悟。After understanding the concept of rules, let's talk about the components of rules. Here we only list the structure of rules in general, and the rules will be summarized separately in the following articles.一个男人死缓服刑20年出狱后的故事......Same as the above measurement parts!