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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:然而看似平静的表像，掩盖不住王宫内外争权夺利的暗潮涌动：忠勇的司法长，王位争夺中激烈对峙的两位王子，野心勃勃的大臣，年轻智慧的王后，阴险狡诈的大主教，冷酷残忍的穆斯林军长，心怀各异的众人，在卡斯蒂利亚王国中上演着一出出尔虞我诈，一幕幕刀光剑影。血海深仇何日能报？动荡的王国如何安定发展？ 宗教的冲突会否重燃战争的炮火？而爱情，又是否能化解种族间的恩怨？站在命运的十字路口，众人将何去何从？由“格里芬”所属的最高级战术人偶构成的“AR小队”成员和人类指挥官一起恢复各地的秩序，在保护人类安全的同时将解开隐藏在那场战争背后的巨大谜团。Discovery频道的《追缉：炸弹客 Manhunt: Unabomber》虽然影评及观众数上都有不错的表现，不过Discovery频道CEO David Zaslav表示他们要退出剧集领域改为重新专注在真人秀类节目，最终此剧转交到电视台Spectrum Originals。不然的话，就算偶然一次能挣大钱，必定不能持久。他刚从外边回来，正赶上这场纷争，见葫芦哥躺在地上生死不知，秦淼和紫茄围着他哀哀哭泣。