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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:沙加路，你确定他不是慕斯林么？不要再尝试外交了，消灭他。Can access relevant databases and report systems so as to make real-time diagnosis and treatment decisions;风流成性的郑在民是某财团董事长的二公子，在父亲的荫庇下过着逍遥的日子。其未婚妻崔英珠为见初恋男友仁旭也要前往雅加达，在民知道后前往其下一目的地巴厘岛。英珠到雅加达，仁旭带她前往巴厘岛游览，却遇上在此等候的在民。英珠慌称仁旭是其大学学长，但二人的表情让在民心中疑惑。在民打电话回去调查，得知了二人的关系，表面上却不动声色……在数个世纪之后，人类重新回到封建时代，那些最强壮、最残忍的人逐渐掌握权力和财富。在被称作“不毛之地”的地方，由七个相互敌对的贵族爵爷分割统治，他们垄断了一切日常生活的必须物资，在忠实军队“剪刀手”的协助下推行铁腕统治。而“剪刀手”的地位远远高于普通人，因此他们愿意为主子牺牲性命。很少有“剪刀手”能活过30岁，但Sunny（吴彦祖饰）并不是普通的“剪刀手”。他精通武术，令人畏惧，并很快成为贵族Quinn（马尔顿·索克斯饰）的首席“剪刀手”、最信任的顾问和摄政大臣 。吴彦祖扮演骑摩托的孙悟空，是一位骁勇的战士，名叫Sunny，讲护送身负重任的少年(唐僧)，寻找传说中的极乐世界。