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:
The main question is a bit inaccurate. Is it physical condition, skill condition or application condition?
Action: Stupid Force
然而此时此刻，刘邦正处在无比的得意中，早已将这遭事情抛到了九霄云外。
We know that IPTables acts according to rules. Let's talk about rules. Rules are actually predefined conditions for network administrators. Rules are generally defined as "if the packet header meets such conditions, this packet will be processed in this way". The rules are stored in the packet filtering table in kernel space, specifying the source address, destination address, transport protocol (such as TCP, UDP, ICMP), service type (such as HTTP, FTP, and SMTP), and so on. When packets match the rule, iptables processes these packets according to the methods defined by the rule, such as accept, reject and drop. The main task of configuring a firewall is to add, modify, and delete these rules.
于是，他不好意思地改口道：要是皇上吃了好，就都拉来也不要紧。
电视剧《干得漂亮》描述的是1941年秋，华北赤城无人村。中国劳工无辜被日本特种兵猎杀，武艺高强的幸存者姚和尚救下指导员高国成，同另外几个身怀绝技的草根组成了日后威震晋察冀战区的抗日小分队。小分队一次次陷入虎穴，进城救出卢政委并接下任务，在完成盗图任务的过程中姚和尚身受重伤险些丧命。随后小分队潜入佐佐木官邸盗药罐，盗罐不成，但在大部队的帮助下一举歼灭头号死敌高腾。幕后黑手、细菌专家佐佐木渐渐浮出水面，小分队全然不知，陆军医，三顺儿相继牺牲，小分队损兵折将。小分队队员为阻止日军细菌扩散，决定将自己的生命与细菌一并尘封古墓之中。
旺天生智力已比常人发展缓慢，年介三十岁，但智商只有七岁小孩水平。旺怀着一颗赤子童心，待人处事态度简单直接。即使遇上挫折，凭着他屡败屡战的精神，最后都会获得成功。
Finger Avatar: hidden weapons [Skill Damage] +40%.
在孩子们的卧室里，生活着五个可爱的瑞奇宝宝。他们性格各异，相处时也会发生些小摩擦；但他们总记得关心彼此、互相帮助，一起面对挑战，共同成长……暖心有爱的故事里还巧妙地融入了认知、社交、艺术、运动等启蒙内容，帮助宝宝开启他们特有的天赋，陪伴他们健康成长。
我不懂，我还是不懂。
Before the tragedy, the pirate gang had already been involved in several robberies at sea, and the police seized nearly 1 million yuan of stolen money at Industrial and Commercial Bank of China.
In fact, it is not necessary to fully understand, as long as the effect is good.
可是二十多年来，周云涛一直在悔恨，在思念。
刚刚好丑女神教三位平凡女性先认丑再积极改变自己追求幸福。@http://www.7edy.com/taiwan/34639/
There is no requirement for the minimum size of the veneer for the time being, but when either side of the veneer size is less than 80mm, it is required to adopt the form of splicing. For detailed requirements of splicing, please refer to the splicing specification.
I. Chinese citizens who have not reached the national legal retirement age at the end of the year when they sign up, have the qualifications for teachers stipulated in the Teachers Law and are willing to work as teachers.
便知道汉王这会在想着什么，这确实是一个棘手的问题，太过的严峻与重要。
