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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:又低头看了一眼香儿，补充道：在下会照顾香儿的，请林队长放心。This part of the confession really makes people want to die. . . . .Disadvantages: The efficiency is a bit low, and the synchronization lock must be judged every time the instance is called.一个少年突然扔掉了自己的跆拳道服。General principle: Open Close Principle)"I don't know, maybe there are enough people. This is really unclear. There is one thing that I think is quite strange. Liu Guiduo asked the crew to call him 5,000 yuan that day. When it was my turn, I called my little sister. She told me that my mother had lost her cell phone and changed her new number. Let me call her and keep saying it. I looked at Liu Guiduo and he said, 'Go ahead and tell your mother to go back in a while. Don't worry'. I didn't think he could let me fight. Maybe he knew that my father had been dead for more than ten years and my mother was the only one in the family. But I thought for a moment and didn't call. I returned the phone. "