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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:(3) Article 28 of the illegal acts occurs again within 2 years after 1 year;该剧讲述了人气偶像胡理（敖瑞鹏 饰）发现自己真实身份为人工智能，因出现不可修复的故障，被公司欲以“抑郁症自杀”的形式销毁，而后胡理逃至女主纪念（吕小雨 饰）家躲避，开启了奇幻浪漫的同居生活。2017-07-18 14:31:11天下没有白吃的午餐，更没有天上掉馅饼的好事，对方并不是前来投靠自己的，而是和自己谈合作的。Console.log ("the leader has come for an interview");