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The core idea is: when the state of the object changes, it changes its behavior at the same time, which is very understandable! Take QQ for example. There are several states, online, invisible, busy, etc. Each state corresponds to different operations, and your friends can also see your state. Therefore, the state mode is two points: 1. You can obtain different behaviors by changing the state. 2. Your friends can see your changes at the same time. Look at the picture:"Waking up" is not a simple game project, it is intended to help the experiencer think ahead of time about how to face the death of himself and his relatives through "life education".唱响劳动号子，歌颂劳动之美，倡导和传承新时代奋斗精神，向劳动者致敬，《劳动号子》打造新时代劳动者专属的音乐盛会。将视野从中华民族扩展至世界各民族，用最具观赏性的实景还原、歌舞表达等手法，唱响新时代的奉献精神。//Modify the state of the original class……无论是杨长帆还是徐文长，根本就没打算在海上决战。《两世奇人Time After Time》由Kevin Williamson开发，根据1979年Karl Alexander的同名小说，以及根据小说所拍的电影改篇。电影版中Malcolm McDowell饰演H. G. Wells﹑David Warner饰演开膛手杰克 （Jack the Ripper），在电影中开膛手杰克真正身份就是外科医生Leslie John Stephenson，当苏格兰场的警探快要抓到他时，开膛手杰克却使用H. G. Wells的时光机去到1979的旧金山，而H. G. Wells也紧随其后，要把凶手绳之于法，剧版穿越后的时空定于现代。