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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:　　上一季中，虽然黄眼魔鬼被消灭，但是地狱之门大开，数以百计的魔鬼涌入人间，黑暗将笼罩这个世界，Sam（贾德·帕达里克 Jared Padalecki 饰）和Dean（简森·阿克斯 Jensen Ackles 饰）将面临前所未有的艰巨使命。与此同时，他们还有着各自的问题：Sam终于了解了自己为何被黄眼魔鬼选中以及它对自己的所作所为。Dean和魔鬼定下了契约救回了Sam，但一年的期限近在眼前，Sam是否真的就是原来那个温柔善良的弟弟。而在人类一方，那些魔鬼猎人也组织起来共同对抗出逃的魔鬼，他们中还有人也将矛头直指Sam和Dean。该剧由著名笑匠史蒂夫·马丁和约翰·霍夫曼（《同妻俱乐部》） 联合创作，讲述三个对真实犯罪有着共同痴迷的陌生人突然发现自己被卷入其中的故事。一对情同姐妹的好友嘉仪、白玲，嘉仪奉父母之命与设计师柯振邦订婚，但嘉仪却对振邦一点感觉也没有；在结婚前多嘉仪在情同姐妹的好友白玲全力支持下，离台赴美结识了梁雨成，结婚并育有一女。另一方面留在台湾的白玲在经歷感情受创后决定出国散心顺道探望嘉仪，却在赴美前夕竟意外捡查罗患胃癌。嘉仪接获讯息后即刻返台，见好友因感情心灵受创而今又患有绝症，决心在好友临死前完成她追求一份真爱的心愿；找不到合适人选的她，只有央求自己的丈夫雨成，雨成在无奈下答应，雨成佯装是自己的双胞胎弟弟雨文，在嘉仪的安排及促成下渐渐获得白玲的好感，另一方面对嘉仪仍旧未忘情的振邦，时常出现在嘉仪左右，不禁让雨成怀疑两人旧情復燃，这四个人的感情究竟会如何发展？When I went back to the master bedroom, the male host said to me that when I heard our * * master's voice, I begged us not to hurt people, and I coaxed him to say yes. Half an hour later, Wang Jiying and Zhao Mou came back. When they came back, they also bought four bottles of drinks, namely black card, iced black tea, green tea, pulsation, buns, biscuits, bottled baby yogurt, ham sausage, two packs of Yuxi cigarettes and three packs of Su Yan. Wang Jiying said that he had taken a total of 11,000 yuan and that the shopping expenses were 100 yuan. After counting, I still had 10,900 yuan left. I put the money on my body. Fu Gang is still in the small bedroom * * the owner, I took Zhao Mou and Wang Jiying into the big bedroom. Wang Jiying found a piece of black cloth in the master bedroom. He blindfolded his master, The legs of the male host were tied with the cut plug-in wires. After tying them up, we turned off the lights in the bedroom. Wang Jiying and Zhao Mou went to the living room to watch TV. I went to the small bedroom to watch Fu Gang * * host. I watched Zhao Mou for a while and came in to watch. Fu Gang got up from the female host and said, "No, no shot". Fu Gang went to take a bath in his underpants.本剧制片人是大名鼎鼎的迈克尔·贝。故事根据同名畅销小说改编，主人公是美军驱逐舰内森·詹姆斯号。当一场全球性的大灾难（注：在原著中这场灾难指的是美国和前苏联之间的全面核战争）抹去地球上绝大多数人口后，这艘战舰因为所处的位置特殊而逃过一劫。现在船上的人不得不面对一个新的现实——他们可能是这个世界上为数不多的幸存者之一，他们在这个世界上的位置和以前已经完全不一样。