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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:布朗神父（Mark Williams饰演）是切斯特顿笔下的著名侦探，矮个子，圆脑袋，身材胖儿可爱。手边常有一把标志性的大雨伞，他天性怕羞，说话有些结巴，看起来憨厚纯真，似乎与探案不搭边，却大智若愚，有着很锐利的直觉。包公升堂，石樵状告自己的次媳石玉奴与裴家少庄主裴慕文串通，谋杀其长子石伯祥，但裴慕文的随从马雄却坚持此案为自己所为。Name: He Cheng　　老爷曹如器令长子曹光满前去郑家提亲，几经周折竟大功告成，使素来不睦的两大家族结为秦晋之好。Private Receiver receiver;However, we need to pay attention to the fact that Some "chains" are doomed not to contain "certain rules", just as some "checkpoints" are inherently unable to have certain functions. For example, "checkpoints A" are only responsible for attacking land enemies and have no air defense capability, while "checkpoints B" are only responsible for attacking air enemies and have no ability to defend infantry. "Checkpoints C" may be NB, which can defend both air defense and land enemies. "Checkpoints D" are the best and can defend both land and sea.