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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:　　申敏儿饰演女政治家姜善英，她当选了比例选区的议员，并成为所属党派的发言人。有传言称远藤贤一宣布了一项“实际退休声明”。　　在百年老字号豆品厂的三朝元老萧秀琼(薛家燕)，以大总管的身份长期包庇远房亲戚涂威龙(林嘉华)，招来太子爷窦彰(张颖康)不满，适逢好友王兆明(黎诺懿)失业兼与女友纪晓盈(姚子羚)分手寻求转型，二人一拍即合决定为公司进行大改革，新旧两派阵营日夜开战，兆明重遇儿时好友司徒岚(汤洛雯)向其尽吐苦水，二人感情大增萌生结婚念头，谁料岚的母亲正是秀琼，岚为与兆明闪婚竟扮作抑郁迫母亲让步，但相见不好同住更难终酿成大风暴，婚后的兆明公私受挫忍至极处，竟想出撮合外母大人和豆品厂老板傅德正(威利)来转移火线，可惜错点鸳鸯，好事多磨，弄来笑话连篇……