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PS: In order to facilitate everyone to see my update in time, I have set up a public number. In the future, the article will be published simultaneously with the public number and the blog park, so that everyone can receive the notice in time. If you don't understand any questions, you can also leave a message on the public number, so that I can see and reply in time. (The public number has just started to be done, and it is relatively rough. There is nothing in it = =, and it will be gradually improved in the later period ~ ~)希望渺茫，不服输的麦昆能否重新取得胜利的荣光……Digital thinking《到火花中去》以60-70年代韩国为背景，不仅仅是沉重又萧条的，这也是韩国要开始近代化的时期，仿佛一台即将出发的蒸汽机车一般，充满了动力充满成功的机会和各种可能性，以及都向着这种可能性奔跑的满怀激情的时代。权力家、国际财团，让这个时代还充满了华丽感，与市民们每天为生计愁苦的样子，在电视剧中同时得以展现。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:在下指的是街坊邻里和亲友，其实世人都这么认为的。　　从英国苏格兰场归国的警探Kemal，即将退休的资深老警探Settar以及研究宗教和神秘学的大学教师Yaşar组成了一个破案小组，调查一个神秘诡异的连环杀人案。