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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:PS：这几天线路检修，老是停电，每天码字上网的时间很短。Require function锁侠讲述的是一个把‘锁’视为生命的普通锁匠，经过艰难的生活磨砺，使自己从普通的锁匠，成为一代“锁侠”的故事。二十年前，雷龙、罗全、赵晓燕本是青梅竹马的师兄妹，但私欲让罗全与他们越走越远。为了师傅珍藏的一本“锁谱”害死了将自己养大的师傅赵典，师弟雷龙侥幸逃脱。二十年后，雷龙改名雷蒙，以他双胞胎弟弟的身份，带着养子雷豹再次出现在了上海，这引起了罗全的注意。此时罗全已成为工商联合会的会长。他暗中勾结日本人，一边掩盖当年的事实真相，一边加紧迫害雷龙父子。由此，一个个阴谋围绕着雷龙展开。最终罗全走向自我毁灭的道路，雷蒙投身革命事业。　　该节目将唤起充满魅力和兴致的"舞痴"们的潜力，展现成长的面貌，预告他们180度的大转变。16With that, Mary smiled a few times, as if to cheer herself up.