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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:上好了香，严嵩才幽幽道：陛下，宗宪走了。师徒四人取经归来，发现时代进迁，突破万难取回的真经一无所用，于是四人隐居阳关市，开起了变身事务所，整日承接各种奇葩业务，靠变身营生度日…..该剧讲述了妹妹孤军奋斗寻找失踪姐姐的故事。民国年间，闻名遐迩的金石大家金性坚（刘以豪饰），他本是上古时期女娲的补天石所化，修炼成人来到人间已数千年。他深爱夜明（古力娜扎饰），为了帮夜明渡过雷劫，他开启了寻找印章的奇幻之旅。剧情以男女主人公寻找八枚印章为主线，开启了一段段或爆笑、或热血、或感人、或甜蜜的有趣故事。围绕着“情”字，展现了生灵百态的爱恨情仇 。该片主要讲述了日本侵占东北前夕，北平警察局号称神探的诸葛弘卷入了一场谍战风云，最终拨开层层迷雾寻得真相，揪出幕后黑手，为祖国安定奉献出自己力量的故事。影片剧情紧凑、悬念迭起，选用了优质主创团队，力保影片水平，王明军再次坐镇执导，全力打造中国谍战片经典。