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Then study four situations in Android event distribution flow chart:到底比不上少年人身子轻巧灵活，在落地的时候摔得龇牙咧嘴。After checking the environment, Redis has been started, and the port is correct, and the address and port of the program connection are also correct. It can be considered that it is not a personal problem, so where did the mistake come from?We do not encourage divorce, but when a marriage is broken, divorce is the best choice for children.武周时期，生活在洛阳洛河水两端，不同出生的两个少女意外被卷入悬案之中，她们同心协力揭穿反派阴谋的故事。故事中的两个主人公分别是金吾卫队长的女儿赵青青，以及混迹于城市底层的女孩小骗子，原本过着截然不同生活的两个人，在遭遇洛阳城内一连串匪夷所思的离奇案件后，组成了搭档，她们历经重重考验，仍然以无畏之心在乱世中坚守着正义。一位在野生动物保护区生活的猎人被迫卷入了一场致命的猫捉老鼠的游戏，他和当地治安官出发去追踪一名凶手，而凶手可能正是几年前绑架了他的女儿的神秘人。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: