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劝和小组有老有少，有男有女，有的父母不和，有的家事不宁，有的重利轻情，有的性格缺憾——就是这些各有烦恼的一群人组成了我们的《劝和小组》。他们聚在一起，去尝试着帮助自己身边的人，同时也在拯救自己。有人曾说，现在的社会日益冷漠，亲情和友情逐渐淡薄，有些人不懂得与人相处，有些人学不会以诚相待，人与人之间越隔越远，似乎每个人都逐渐变成一座座孤岛……神偷仇亦森在十年前盗出一对印制美金的模板，旋即遭女友章曼莉出卖，入狱十年，但唯一知道该模板下落的只有仇亦森一人。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:Remember when I was working on the front end, That is, the first company that has just graduated, It is a company that does outsourcing projects. The company generally outsources Taobao activity pages and Tencent's game pages, We should have called it cutting the front end of the page at that time. Do some html and css work, So when I was doing Tencent's game page, Often help them make static pages, For example, put a few buttons on the page, We just helped Tencent games to fix the style according to the design draft. For example, the buttons on the page and so on, For example, how to operate the specified buttons, What happens when the button is clicked, We don't know, We don't know what their business is. Of course, what we know will definitely be a click event. We don't know exactly what business to deal with. Here we can use command mode to deal with it: after clicking the button, we must send requests to some objects responsible for specific behaviors, which are the recipients of the requests. However, at present we do not know what the receiver is or what the receiver will do. At this time, we can use command mode to eliminate the code coupling relationship between the sender and the receiver.我还没爱上他。