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Observer mode, template method mode, command mode, state mode, responsibility chain mode(2) Activity Abnormal Life Cycle and Application大苞谷一翻眼道：不管他。After implementation, summarize, you can write a blog or record your own cloud notes, etc.When novices use professional mode, they should choose different parameters according to different environments.The police searched for the suspects in the surveillance of various transportation hubs. Everything comes to him who waits. Through video surveillance, they found that the four suspects fled from Jining to Xintai on the bus. Finally, the police caught up with the long-distance bus in Anyang County, Tai'an City. On the afternoon of May 17, investigators arrested four suspects. They did not expect the police to find them so soon. All four criminals were arrested and the whole arrest process took only one or two minutes. At 4 pm, the four criminals were escorted back to Fei County. At this point, all the investigators' questions finally have answers.