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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:刺杀汉奸的复仇行动。在铲除“汉奸”头子——女医生陈如歌时，方元隐隐感觉陈如歌并非汉奸，二人随即陷入汉奸设置的重重危机，从而刺杀变成了保护。其后在陈如歌的帮助下，方元加入了中国共产党领导的抗日队伍，并在抗日救国行动中与陈如歌相知、相爱。二人的爱情历经战火洗礼，经过几次生死离别之后，方元与陈如歌在工作中产生误会，导致二人情感破裂，在感情路上分道扬镳。但二人共同的爱国、救国情怀令他们彼此挂念，最终在抗日战争全面胜利之时重新走到一起，携手迎接新中国的到来该剧讲述了三个不同家庭的男孩子，从不羁少年成长为真正男子汉，在迷失和沉沦中寻找尊严，友情，亲情和爱情的励志故事64-bit processor and operating system requiredIterator patterns are created for collection objects, For collection objects, It must involve the addition and deletion of collection elements, and certainly supports the operation of traversing collection elements. If the traversal operation is also placed in the collection object at this time, the collection object will bear too many responsibilities. At this time, the responsibilities can be separated and the traversal of the collection can be placed in another object, which is the iterator object.(2) Another additional benefit is that when the request arrives, the worker thread usually already exists, so the execution of the task will not be delayed due to waiting for the thread to be created, thus improving the responsiveness.金傲为保护中华傲决与无敌大战，垂危之际将中华傲决传给华英雄。“天煞孤星”命格的华英雄失去了自己的父母及妻子，他离开儿女亲友，潜心修炼20年却始终无法参透中华傲决，最终在与无敌的大战中顿悟，战胜无敌。