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Conclusion: As long as there is this instance in the task, the page with singleTask set will be reused all the time, and every time the existing instance is reused, the other instances above (FirstActivity here) will be emptied, and the page will be directly promoted to the top of the stack, that is, it will display itself.　　于是，这本该灭绝的王朝开始了一场新的混乱……杨长帆拍着黄斌笑道，往后的事，多帮忙，比什么都强。Https://www.jiemian.com/article/2109093.htmlSince the International Olympic Committee stipulates that only amateur soccer players are allowed to participate in Olympic soccer matches, Olympic soccer matches are not the highest level matches in the world. There are two categories: men and women.Structural patterns, as the name implies, discuss the structure of classes and objects and are mainly used to deal with the combination of classes or objects. It includes two types, one is class structure pattern, which refers to the combination of interfaces or implementations by inheritance mechanism. The second is the object structure mode, which refers to the realization of new functions by combining objects. It includes adapter mode, bridge mode, decorator mode, combination mode, appearance mode, element mode and agent mode.The root of driving people to do addition (efficiency optimization) and even multiplication (efficiency optimization with leverage) is actually a greedy and impetuous heart. Of course, there are geniuses in the world, but it is unwise to bet on such a small probability event as being a genius. However, people would rather pursue the dream of ignorance than think about the most essential laws and simple methods of investment.