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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:老者笑咪咪走到杨长帆面前，提了提手上的绳尺：千户吩咐我过来帮忙。《变形计》是一档以关爱和反思为视角，关注当代中国青少年教育和成长问题的青春励志生活类角色互换纪实节目。《变形计》第十八季依然采用双边互换的形式展开变形，多维度关注和解析00后少年成长生态。玛雅和阿马拉是闺蜜，她们形影不离常常腻在一起，但自我认同都是钢铁直女，有一次，两人一起参加一个派对，在酒精的作用下，两人发生了超出闺蜜以外的行为，她开始对对方的感情产生怀疑...毕竟一旦城破，想要还有一线生存的机会，只能死远走汉国。Just like Gu Xixi's speculation, someone really whispered on Jia Min's ear. Jia Min wrinkled up...布奇（乔什•哈奈特 Josh Hartnett 饰）和李（艾伦•艾克哈特 Aaron Eckhart 饰）都是拳击界的佼佼者，李被称为“火先生”、而布奇则被称为“冰先生”。李在警局执行组，而布奇则比较落魄。在警局举行的一场拳赛上，布奇故意输给了李，以此跻身了警局，成为李的搭档，两人更成了无话不谈的好友。