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两个情同手足的少年，在这座城市一起长大。因为宿命使然，他们分道扬镳，其中一个要去外面闯荡，另一个则选择留下，于是在出发前晚，两人相聚一个小餐馆，约定二十年后的同一日期、同一时间，来到这里再次相会。 二十年后，桑晓遍体鳞伤的回到了原地，却发现小餐馆已经变成了十字路口，他在那里等了许久，遇到一个等夜班车的男子，两人聊起了二十年前的那个约定，让桑晓没有想到的是，这个男子就是约定好二十年后跟他再见的苏强。而更令人想不到的是，二十年的岁月磨洗，已经让桑晓变成了一个恶行昭彰的通缉犯，而苏强却成了一个正义无私的警察。兄弟二人重逢在十字路口，再次面临宿命的选择。Step 2: Study User Needs降妖术士王子服和唐闻委托干铁锤打造“伏魔神兵”，谁知干铁锤爱慕王子服不得却意外身亡，灵魄阴差阳错进入狐妖婴宁体内。王子服和唐闻在追查干铁锤下落的过程中，发现婴宁的秘密，开启了一场奇幻之恋……说句不知好歹的话，孙铁还指望大少爷将来得了富贵，好跟着享福呢。这部剧虽然是我拍的，但是我可不能居功。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:For example, this ISO file on my desktop! It looks like a compressed bag, hehe! Show that the extended name is indeed. Iso.