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After studying the design pattern during this period of time, I still have a lot of feelings, because when I am writing code now, I often think about whether I can use any design pattern to refactor here. Therefore, after learning the design pattern, I feel that it will slowly affect the way you think about writing code. Here is a summary of the design patterns. First, all the design patterns can be sorted out. Second, an index can be made to help everyone collect.Four fairiesWhether evacuation signs and emergency lighting are in normal condition; Whether the detector of the automatic fire alarm system is in normal condition; Whether the sprinkler head, end discharge (test) water device and alarm valve of the automatic sprinkler system are in normal and intact condition; Whether the indoor and outdoor fire hydrant systems are in normal condition;陈平看着刘邦、张良远去的背影，笑道：此事但凭尹将军做主，陈平全力配合。　　《地心毁灭》是部一流电影，这个说法有双重意义。2. Do not intercept, pass the event down to the child View---> return false, ViewGroup does not intercept by default, so super==false;可是万万没想到会如何之快，会是这样的结果。