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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:In fact, delegate variables (parameter lists) and events execute methods in this form.Advantages of Publish Subscription Mode:1962年靠山庄农业获得丰收，党支部书记赵五婶主张把余粮卖给国家。五婶的丈夫大队长赵大川在坏分子王学孔的煽动下自作主张地把余粮交给驴贩子出身的王老四去调换牲口。五婶抵制了丈夫的本位主义思想，派人截回粮食，并揭发了王学孔和王老四合伙进行投机倒把的行为，终使丈夫醒悟，把余粮卖给了国家。看着老实巴交的爷爷不知如何应对，又不敢随便让人进来的尴尬模样，黄豆轻声对二哥道：你别吱声。《特区少年》是一部由深圳市中小学生自编自演的百集教育系列连续剧，魏宾仁先生担任总导演。本剧以“服务少儿教育，树立社会主义荣辱瞧”为主题，反映当代深圳少年儿童现实生活的百集少儿系列剧。可是，往后再不会有这样的日子了。