The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:
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:
该剧讲述了一位“法律上已宣布死亡”的前CIA特工，受雇于一位神秘的亿万富翁，打自主正义牌，用私人力量来打击犯罪保护人民。
刘邦是脸色铁青，本身他就大不愿意和韩信联合，也是出于众臣的劝谏和无可奈何才这么办的。
晨间剧《夏空》讲述了这样一个故事：奥原夏是一个失去了双亲的少女，治愈这位受伤少女并将她培养成一个坚强的人的是北海道十胜郡的土地。终于长大的成人的奥原夏凭借着十胜所赋予她的想象能力，向着当时还被称为“漫画电影”的动画世界发起挑战。 女主角奥原夏虽然是一个失去双亲并与兄长分离的少女，但是凭借着北海道出身者的“开拓者精神”向名为动画的荒野进发。剧本大森寿美男表示：“想将如此巨大的伟业和广濑铃这个稀世的女主角重叠在一起，主题开门见山地说就是‘开拓’和‘链接未来’。
A circular silk screen with a diameter of 2.5 mm is placed on the silk screen layer to surround the test pad to identify the position of the test point, and the number of the test point is marked beside the silk screen, such as X1, X2, …, etc. The test points shall not be covered with solder resist or text ink.
该片讲述了一个由一把唐朝古琴“玉香散”引发的“局中还有局，谜里又是谜”的有趣故事。“寻回者”牧云野与端木公平二人以负责为委托者寻回为生，在完成豹子强寻回翡翠玉佩的任务后，陆续接到与之相关的任务，一个巨大的谜团在他们面前展开。另一面，身手高强的路星船与女黑客沙莎为了古琴接近徐远，不料徐远被人谋害身亡。作为徐远的老友，牧云野与路星船联手，在经历一系列冒险之后，三人逐渐接近真相。
与挚友的竞争，来自所爱女性的告发在失去很多的同时，男人最后得到的东西是…！？
Now we can still see the decimal system, such as 12 months a year, 12 hours of clock rotation, etc.
Long Xiao Piercing Cloud Gun: When equipped with Ya Jiao Gun, total damage * (1 +0.3).
指名手配の男 加勢大周 中島唱子
吴老二进城务工，投奔在城里卖手抓饼的大哥，不料爱上了性感嫂子阿莲。青年土豪庆庆是阿莲的初恋男友，偶然相遇，激情火花四射，一段五迷三道、遍地奇葩，大打出手的故事就此拉开了帷幕……
一名印度裔美国选手连续 12 年赢得著名的斯克里普斯全国拼字比赛冠军，这是体育史上保持最久的记录。《拼字王》讲述了四名印度裔美国学生在追求赢得标志性锦标赛冠军这一梦想道路中的起起落落。这部电影从 CNN 的桑吉·古普塔博士和法里德·扎卡里亚、喜剧演员哈里·科达博卢、ESPN 的凯文·内甘迪、1999 年斯克里普斯全国拼字比赛冠军、努普尔·拉拉等人的精彩视角，探索了这一令人难以置信的胜利背后的原因，以及给社会带来的影响。萨姆·雷加担任导演和制片人。由克里斯·韦勒制作。
不仅要刺中想刺的位置，还要能及时闪避，不要碰上树干。
Next, you need to bind the two buttons to click events respectively:
本作品是以在中坚饮料制造商的长期工作、开朗可爱的上班族猿川健太为主人公的美食喜剧。描绘了从大阪总公司满怀期待调到东京分公司的猿川，和古怪的人们一起追求“激辣道=激辣辣辣道”，并成长起来的模样。
(3) Power on the control coil to detect the contacts. Apply rated voltage to the control coil of the time relay, and then detect whether the contact state changes according to the type of the time relay. For example, for the energized time delay type time relay, after the energized time delay, whether the delayed open contact is closed (the resistance is close to 0) and whether the delayed closed contact is opened (the resistance is infinite).
利索。
3. Channel goods, the original factory has no standard. The purchase price is more than ten dollars cheaper, and it is cheaper to take more. Compared with 2, there is no mark, and the rest is no different.
