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Copyright All reprints must be approved by Excel Skills Network.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:那是很久以前的事了。那个时候，还没有冥界，天柱连接着天和大地，天空不像现在的天空，那时候的天，悬在云端里。在后世的记载中，它还有一个名字，叫做“昆仑”。人类，是神创造的，世间一切，都是神的子民。昆仑山的天女来到了人间。天女，是神的使者。然而在人类中，出现了一种疾病，那是一种令人丧失心智的疾病，那就是...可大苞谷那是能吃亏的人？他说出来的话更是气得人肝都疼。12 \"Tekikan Miyu\" (敵艦見ゆ)当年的浪漫剑客如今纷纷尘埃落定：弥彦成长为正直善良的剑客；左之助也少却了青春孟浪，变得沧桑；剑心的儿子剑路同样拜入比古清十郎的门下，誓要成为绝世高手，却与父亲分外隔膜；剑心接受政府的任务赶赴大陆战场，为了赎回前半生的罪过而疲于奔命，逆刃刀从此封存，家中只留下病弱的阿薰苦苦等待。为今，严党倒，俺答饱，杨博也是时候回来了。