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山芋抹了一把眼泪，慌忙撒腿奔了出去。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:"It's also our little Charlie's credit!"随口道：生气。Among them, in case of injury stop, regulation, suspension and other events, the timer will temporarily stop timing until the competition resumes. That is, although the competition time is only 48 minutes, the actual competition duration will be much longer than 48 minutes, usually more than two hours. It depends on the specific situation.唉，有时候选择太多，也是非常苦恼的。