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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:Through the study of singleton mode, we are told:他记起那晚在河边的茅屋里，尹旭和自己夜话谈心，开导劝慰自己，更重要的是一直规规矩矩，没有非分之想。Join the army of chasing more. Although I have long been accustomed to paranormal, it is the first time I have seen this type of paranormal.讲述了女大学生章天音与其隐形男友苏子相识相知相爱的故事，在他们相处和相恋的过程中，章天音母亲被害的真相以及苏子自身二十多年的隐秘都渐渐浮出水面。真爱也许在我们心中不再永恒，但是我们相信这样的爱情存在于天堂……本剧讲述了被不应该出现于世的那个东西迷惑的人们，与追查前所未有怪异事件的考古学家们发生的一系列故事。