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Writer: (///Cave for hiding corpses但是，谁都知道，武侠小说是虚构的，现实中不会有那些神奇至极的武功。　枪击事件导致Fred生命垂危，亲眼目睹一切的Archie彻底情绪失控。与此同时，Veronica决定尽力支持Archie，但这意味着她将离开自己熟悉的安逸环境。她突然得知父亲已经提前出狱，并且已经回到河谷镇…怀揣演员梦想的钟韩自筹资金拍摄电影，却遭遇票房滑铁卢！债主凶恶逼债、兄弟反目成仇、妻子扬言离婚负气离家！眼看着一切梦想即将夭折在现实中，钟韩陷入痛苦的泥沼，这时一名“疯女人”的出现却让他的命运走向了反转！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:Defines the skeleton of the algorithm in an operation while delaying some steps to subclasses. TemplateMethod allows subclasses to redefine certain steps of an algorithm without changing the structure of the algorithm.