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郑氏尴尬，忙赔笑道：娘，我就是这么一说。想求亲的人家过几年工夫再来。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:H一个不负责人的将领死了，至死也毫无半分责任心。她是特德（Alex Jennings）结婚35年来的第一个她自己度过的日子，直到他离开了她。决心度过美好的一天，茱莉亚（Julia）离开了德文郡（Devon）的家，前往伦敦与她的孩子们庆祝-但他们一次又一次地让她失望。蒙古女孩阿茹娜是一个摇滚歌手，因为灵感枯竭而去国外寻找摇滚的真正意义。最后她找到的却是“马头琴”。为了完成对男友生前的承诺她回国成立了站立式演奏马头琴的组合“东方神骏”。历经坎坷，最后终于站在了央视大赛金奖的领奖台上。