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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:格雷西的母亲是一名出色的联邦特工，在一次任务中不幸殉职。格雷西（桑德拉•布洛克 Sandra Bullock 饰）长大后继承了母亲的事业，也成为了一名联邦特工。格雷西从小就脾气刚烈、不修边幅，作为“假小子”的她并不受欢迎，只有她的拍档兼好友艾瑞克（本杰明•布拉特 Benjamin Bratt 饰）理解她。妹子要追，小说也不能丢下。R庞取义大笑拍了拍杨长帆，侄儿现下也算是场面人了，在会稽响那是当当一号人物。Side Strike: Total Damage * (1 +0.25). Try to hit the side when backstab is not possible.有贼人。