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Condition 5 3655.77982Policy pattern refers to defining a series of algorithms and encapsulating them. However, policy pattern not only encapsulates algorithms, but also encapsulates a series of business rules. As long as these business rules have the same objectives, we can use policy pattern to encapsulate them.Episode 7Conclusion: 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.Thus, the consumption of one event in the event sequence will affect the distribution of subsequent events.《智胜鲜师》为2011年多曼尼制作有限公司制作的新校园喜剧，本剧是2000年～2004年校园偶像剧《麻辣鲜师》的续作,由曾国城、叶民志、郭昱晴、杜诗梅主演。