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D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:一来截断了项梁的补给线，同时相当于在项梁背后插了一把刀，只怕从今日起，项梁再难安寝。全剧共5季63集，于2001年6月3日至2005年8月21日在美国有线电视频道HBO首播。最惨“美强惨”司凤的漫漫追妻路，看纯情小凤凰心动全纪录。(Tang Lin, Producer of CCTV Financial Channel "Charming China City")Services: Functions provided by the system that users will benefit from in their use.《丑妃驾到》主要讲述了巫族圣女米七七（胡意旋饰）因缘际会流落人族，卷入义岐王吕敖（张思帆饰）后宫之争，最终二人携手平复了三族之乱，还民以太平天下的故事。