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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:For collaboration files, it is not necessary to check out, as long as you have modification permission, you can modify them.爆炸头青年田中广(贺来贤人饰)至今还未和女性亲吻过。工作被开除后经原公司社长介绍，从琦玉来到了东京。上京后，他每天在隧道工程公司工作，流着汗，过着健全的日常。一天，与田中同住在公司宿舍的铃木小班班长（小泽征悦饰）邀请他参加联谊。西田前辈（松尾谕饰）和与田中同年的高桥（白石隼也饰）也参加了这场联谊。田中在那里和丸之内OL真希(夏帆饰)命运地相遇了。Cow force如果你问科迪·马沃里克，谁是“大Z”啊？那么你算是问对人了……哦，抱歉，是问对企鹅了。科迪是一只年轻的跳岩企鹅，而“大Z”就是他的偶像，一位传奇的冲浪运动员。然而在10年前的最后一场冲浪比赛中，他却消失在海浪里，再也没有回来，所有人都认为他死了。就是在那场比赛中，是科迪第一次见到“大Z”，随即就被这位传奇冲浪手的风采所倾倒，疯狂地爱上了冲浪运动。《行尸走肉第六季》全集根据托尼·摩尔（Tony Moore）的同名漫画行尸走肉改编，是美剧电视史上第一部正宗的丧尸电视剧。行尸走肉全集主要讲述的是主人公Rick在执行公务的过程中遭到枪击，伤势严重，被人紧急送往当地医院进行抢救。当Rick醒来之后，发现医院里已经空无一人。他意识到外面一定出了大事，但又不清楚到底是什么事。全剧围绕主人公Rick（译：瑞克）在丧尸蔓延、危机四伏的美国四处逃亡时与他的同伴的经历展开，剧情扣人心弦。After receiving the report, the police arrived at the scene and found more doubts besides the killed puppy: