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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:上海五万人会场，所有人翘首以待，等待ROCKY的出现……Fox宣布续订《紧急呼救：孤星》第二季。截至目前，《紧急呼救》第三季为Fox台本季度观看人数最多的剧集，《紧急呼救：孤星》为Fox台本季度18岁-49岁人群观看人数最多的剧集。What kind of water are you drinking要让他们舍不得逃。李千云为完成家人的愿望和实现自己的梦想，踏上了追梦之旅。在青梅竹马方艺的陪同下，一起前往新的城市生活打拼。在飞行途中李千云因过度紧张而晕倒，幸好当时的空姐何霄霄救了他。靠着自己的努力李千云进入了航空培训基地，偶然的缘分让他又遇到了空姐何霄霄，在何霄霄的帮助下，李千云不断克服自己的困难，化解心结。李易凡隐藏自己富二代的身份追求方艺，欢喜冤家，亦真亦假。最终，李千云在经历了退学和停飞事件后，开始成长，最终成为一名合格的空乘，也开始尝试追求自己的幸福。爱的飞行模式才刚刚开启。Ctrl + O: Open the image file