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This is also the longest interview question in the interview. Of course, it is also personal work experience and reference to netizens' blog posts. If there are any mistakes, please criticize and correct them.3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process.Mobile phones have grown rapidly in the past 10 years, with shipments reaching 1.4 billion units in 2010, but demand is still not saturated. At the same time, the miscellaneous nature of mobile phones is also increasing day by day, shifting from 2G of pure voice to 3G, and recently to 4G multifunctional smart phones. In addition, Wi-Fi, Bluetooth, Global Positioning System (GPS), FM radio and other wireless connection functions also increase the complexity of mobile communication.桃色新闻包裹着一桩命案在艺术学院校园里爆炸——美术系女学生唐诗韵失踪，留下一封遗书声称为老师边城殉情了。警方介入调查，唐诗韵活不见人死不见尸，一桩无头案不得不悬起来。边城妻子柳寒烟是音乐系教师，丈夫的“风流韵事”如晴天霹雳炸碎她的心灵，两人的婚姻命悬一线……由微博体育出品的《篮球之神迈克尔-乔丹》是一款讲述了乔丹从出道、辉煌到退役的传奇一生，看过纪录片你才会完全认一个自己喜爱的球星，一个从神回到人间的超级巨星。单口喜剧演员梅·马丁不仅要应对戒毒问题，还要经营与新女友的热恋关系，而女友以前是个异性恋。During the process, the participants shall not interfere with the competition of other teams. Otherwise, the competition will be disqualified.