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2. To create a new world, remember to choose "Allow Cheating" so that players can enter more instructions to complete various fast and convenient operations.There are no established rules for the three-person four-legged competition. The rules vary according to the competition venue, participants, number of participants, purpose of the competition, etc.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:Baidu on their own to find!Is there any other reason besides the above that can cause peculiar smell?