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沈朗（郑嘉颖 饰）自信只有靠着良好的人际关系才能成功，于是他十分认真对待收到的每一张名片，每次都将新的名片信息存到自己的PDA，沈朗的努力没有白费，他工作的酒店里的上上下下和他关系都十分好。岂料一天的沈朗的PDA遗失了，被与酒店相连的傲翔坊大商场的一个商户逸诗（周丽淇 饰）拾获。逸诗小时候青梅竹马的一个大哥哥曾告诉她做人一定要诚实，这句话一直深深影响着她，所以逸诗一直千方百计想找到PDA的主人。岂料PDA上的资料后被姐姐逸岚不小心删除，而沈朗也因为遗失PDA影响到了工作被调往负责傲翔坊的工作。原来沈朗就是逸诗青梅竹马的大哥哥，两人在商场相认。但是逸诗发现沈朗似乎已经不再是以往那个诚实的大哥哥……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:王建强和叶齐山结识，发生了很多啼笑皆非的事情，当然王建强也一直在为老叶寻找着机会，其实王建强帮老叶第一是因为觉得做老叶的经纪人确实是个不错的想法，第二王建强是真心欣赏老叶这个人，就像那个屹立不倒杯，不屈不挠永不倒下。翘儿张大嘴巴惊呼，这得有多少？合银子得有几十两了。CanoeClass has only one instance. Q: How can we guarantee it? Answer: Private constructors are used to ensure that classes cannot be instantiated outside the class.