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Public class User {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://Register multiple delegates for the eventThe learning platform of "Learning Power" consists of two terminals: PC terminal (website) and mobile phone client. The website of the PC side is www.xuexi.cn, and the client side can download it free of charge in various application stores. This reporter logged on to the website and downloaded the mobile phone client in the first place.挂掉电话后，陈启坐在椅子上，开始考虑起来。杨长帆咽了口吐沫道：来来，然后咱们在这个大扇贝上添两个孔。先动手本来就理亏，何况英布以前还是项羽的臣子，现在这样做，无疑有种背叛的意思在内，在道义上已然输了，对战局很是不利。