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Next, we will enter the code writing phase of the state mode. First, we will define three state classes, namely offLightState, WeakLightState and strongLightState. All three classes have a prototype method buttonWasPressed, which represents the behavior that will occur when the button is pressed in their respective states. The code is as follows:练霓裳和卓一航的这段爱情中，其实卓一航付出的一点也不少。What should I do if I encounter a bottleneck//038Fifth, the current curriculum system for online thinking ability training products is slightly thin, and the curriculum content needs to be continuously polished and improved.4a7795e0ab3340dcab23a7f128bf72c4　　农村出身的拉丁舞老师余梦辉（张敬轩 饰）在被要求比赛三连冠的压力下，以严苛的方式训练少儿舞蹈队，但比赛却以失败告终余梦辉还被家长揍了一顿。心灰意冷的他回到乡下父亲（林雪 饰）的菠萝园，怎料小队员们追来，在舞厅老板蓝姨（郝蕾 饰）的说动和小朋友的努力下，余梦辉重整旗鼓，他决定带着小朋友们重回舞台，却错过了第二场比赛，同时一场真人秀比赛向他们发出了邀请，等待他们的将会是什么？In the historical substitution principle, the methods of the subclass to the parent class should not be overridden or overloaded as far as possible. Because the parent class represents a well-defined structure, subclasses should not destroy it casually by interacting with the outside world through this standardized interface.