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Some common behavior methods will be defined in the state class, and Context will eventually delegate the request to these methods of the state object. In this example, this method is buttonWasPressed. No matter how many state classes are added, they must implement the buttonWasPressed method2. Use Migration Learning to Protect New Products故事以如罗马假日般的邂逅——一个名为拉吉尼尔的保守小国的王子流落到英国并与当地的一位女子相爱，最终这如花的恋情却在二战的炮火以及悬殊的身份差异中被迫凋零。但主线却是在50多年后，讲述了一位商界精英别有用心地安排女儿花鹿进行选夫游戏。这位名叫花鹿的灰眸少女正是50年前相爱两人的孙女。牵扯到拉吉尼尔国王位之争的少女的爱情之路又会开出什么样的花朵来呢？而三位被挑选的竞争对手也散发出不输给她的光彩来彰显自己的存在……Tu Mun StreetThe third match will be played by C and the winner of the first match, so that everyone can play 2 matches and still keep the suspense of the match.I/O multiplexing refers to using a thread to check the ready state of multiple file descriptors (Socket), such as calling select and poll functions, passing in multiple file descriptors, returning if one file descriptor is ready, otherwise blocking until timeout. After getting the ready state, the real operation can be executed in the same thread or thread execution can be started (such as using thread pool).