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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:《爱情公寓之球爱酒吧》是国内首部以足球为背景的网络情景喜剧，它讲述了一个发生在名为“骚客”的足球酒吧，有球、有爱、有笑、有泪，奇葩创意层出不穷的故事。酒吧老板苏克是个有重度处女座洁癖的球迷囧男，为了抵御对面高富帅酒吧的韩范老板朴教授，联合毒舌御姐女招待祁丹、没谱花少主厨大罗，还有热爱自拍的呆萌90后波波组成的不靠谱青春联盟，展开了一次又一次令人捧腹大笑又创意无限的斗智斗勇。Socks are often used in our life, but you know that the final packaging of socks after production is done manually, which requires workers to pack them by hand in pairs, which takes time and effort. Cui Hai invented a sock packaging machine. As long as the socks are folded and placed on the machine, the process can be completed in two or three seconds, greatly saving time and reducing production cost. (I Love Inventions 20160723 Socks Wear New Clothes)A group of four friends follow their dreams after graduating from college together.两年的时间，他已经从一个青涩懵懂的小女孩完全长成懂事的大姑娘。你可算过成本？5000只全算下来，10两上下，承受得起。