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4. Use vinegar to remove peculiar smell? For a while? Need a car, need a place? This method can be adopted for a period of time.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:我要扮作哥哥的模样，代替他建功，等他回来，再让他恢复原身。"Of course, it is impossible for fur to resist bullets. As long as you hit it accurately, you can kill one with a maximum of two shots. The speed is not slow, but it is not impossible to hit. If they only run on flat ground, then there is really no threat, but-they will drill the ground!"What is called here is the event pool mentioned at the beginning. First, see if there are any event objects that can be reused. If not, instance one again.爱不爱栗丝李敬文顿时像被施了定身咒似的，痴傻呆愣在原地。