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:
"Bus and subway all-pass one-day ticket"
小丫与廖平凡毕业后，一起在工作岗位上打拼了多年。廖平凡以各种理由推诿拖延婚事。今年，廖平凡又说等来年混好了再正式提亲，小丫一气之下应征了二麻租媳妇的这档子事儿。
该剧讲述背景,实力,脾气完全极与极的两位医生因稀里糊涂就附体为开始,灵魂和身体合为一体后发生的幽灵医生们满腔热血的故事。
豪强为救豪杰中枪。唐英明得知后大怒，开枪打了豪杰，唐英明趁豪杰受伤决定让胡南带豪杰去香港戒烟，也好逃开巡捕的追捕。
1977年北京。北方大学的校园中从未有过今天的热闹场面，一批饱经人生磨难的"老三届"们重新获得了渴望已旧的求学机会，他们即将续写逝去的青春断代史，用他们特殊的人生阅历和饱满的生活激情，以次为生活的起点，在以后的岁月中不断认识和发现自己，寻找和实践着自己的人生理想，从而成为极富特色的"七七级""七八级"，逐步成为我们今天社会的中坚力量。
Before proxy!
听闻此言，大家本能一缩，好像是这样的。
Orange: Rubia cordifolia, Coptis chinensis, Onion, Peach.
1922年，在苏城这个有着百年清誉江南小城，甄府是一个雄霸一方，风光了百余年，摇曳着腐朽、糜烂气息的封建大家族，甄千业是甄氏家族中的太上皇，是一个敢说敢做的混世大枭雄和占尽苏城金钱权势的大恶霸。甄家大少爷风流倜傥、儒雅英俊然而却嗜吸鸦片，整天醉心于灯红酒绿的奢靡生活。甄府少女甄妤虽拥有闭月羞花之貌却满身都是恶习，还嗜食鸦片，举止开放成了一朵即将绽放的恶之花！
羊历3513年，青青草原上，羊羊族群已经十分兴旺发达。在羊羊一族里面已经有小镇，有学校，有超市，有美容院，所有羊羊族群的羊都幸福快乐地生活。可是，在对岸的森林里，灰太狼带着他的妻子红太狼却对着一群群的肥羊咽着口水，当灰太狼的身影再次出现在石桥的栏栅前，羊羊族群...
A disaster. "Records of the Historian, Confucius Aristocratic Family": "(Gong Liangru) said: 'I was killed by my teacher in the past, but now I am killed here again, and my life has already passed." " Qing Ji Yun's "Notes of Yuewei Thatched Cottage, Luanyang Summer Record 5": "Although it is violent, it is good for its aunt, but there is a reason why she will not die." Ding Ling's "Water": "If you go to the town and want to find the mayor or director, give us some food first. We were killed last night." 2. Death due to persecution or accident. "Biography of the Three Kingdoms, Wu Zhi and Sun Ce" and "In the first year of Xingping, Yuan Shu. The technique is very strange. Pei Songzhi quoted Jin Yu Pu's" Biography of Jiang Biao "with the annotation of" Jian Bu Qu Hui Ce ":" When he met Yuan Shu in Shouchun, he wept and said: "The dead father entered from Changsha to beg for Dong Zhuo, and met the Ming emperor in Nanyang. The alliance was well formed. Unfortunately, he was killed and his career did not end." " Chen Qiyuan of Qing Dynasty "Yong Xian
[3]
(3) Every month we have to write down the work plan for the next month, which is divided into several weeks. Our work basically changes little when and what we do, so there is not much change every week, but there will be some other unforeseen jobs at any time, which cannot be reflected if written for one month at a time. In particular, the last time I wrote the work plan for the second half of the year, it was broken down into each month. Standing in the middle of the year and looking at the end of the year, I could only list the general plan. It really made me very upset.
DDoS Attack and Defense: From Principle to Practice (Part I)
这个大汉有着两条如同发墨般的浓眉，棱棱的颧骨，乱糟糟的胡渣子，瘦骨嶙峋的大手，一柄已锈得快烂的铁剑……这就是天下第一剑燕南天？虽然书中还没有揭示答案，但是郑武感觉已经**不离十了。
Article 13 [Information Report] The medical security administrative department under the State Council shall establish an information reporting system for designated medical institutions. The medical security administrative department of the people's government at or above the county level shall strengthen the inspection, spot check, analysis and application of the information reported by designated medical institutions, and deal with the problems found in accordance with the law.
《十荒六梦之初恋》分别通过影视二创讲述了剧中人物新的故事，龚俊与戚砚笛的温柔陷阱，王一博与宣璐的猫鼠游戏，剧已完结剧中人还在，二创之后赋予其新的感动与温暖，所有都未完待续，传递一个存在于剧之外的新生故事。
故事主轴以马雅人的2012/12/21末日预言贯穿。末日不如预言发生，但是贪婪的人类对自然和社会的无度需索，予取予求，终于有一天新能源厂事故，造就人类自食恶果，文明毁灭。
In any case, IT is an attractive business!
