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Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.2017-07-15 21:27:01In 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:注：第一集两集连播，总计26集二人并马随军前行，徐渭不禁叹道：想不到，就是这批人竟胜了鬼倭。唐伯虎，江南第一才子，唐家霸王枪当代传人。夜晚，棘原秦军大营。