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毛海峰眼睛微微一眯，还淘到宝贝了。Industrial Revolution 1.0-Age of Steam: It began in Britain in the 1860s, with the invention and application of steam engine as the main symbol. Human society entered "Age of Steam". Human society changed from agricultural handicraft industry to a mode of economic development driven by industry and mechanical manufacturing.Finally, let's briefly talk about how IoC is implemented. Imagine if we implemented this dependency injection function ourselves, how would we do it? Nothing more than:　　银风集团的总裁薛风是一个非常神秘的人物，他深深地爱着寥芳华，但是又深深地恨着林志航，因为当年林志航见死不救，导致薛风曾经身陷囹圄，做了十几年的牢。Conclusion: As the name implies, singleTop, if the current instance is at the top of the current task stack, it will be reused directly to test scenario 1. If the current instance is no longer at the top of the stack, create a new instance, such as Test Scenario 2, because it jumps from FirstActivity to SecondActivity every time. Although the SecondActivity instance already exists at the time of jumping to SecondActivity for the second time, another SecondActivity instance is created because it is not at the top of the stack.