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Let's look at EventHandler's source code first.猫国王会聚集全国的猫举行的集会。猫国王叫做猫妖精，是胸前有白斑，体型像牛一般大的黑猫。亚利亚和姬都有参加这个聚会。举行集会的地方是火星还没有被称AQUA（水星）的时候就存在的厂房的废墟。China's Battlefield: A total of 1.48 million Chinese troops died and 440,000 Japanese troops died, with a death ratio of about 3.36: 1 on both sides.杨祭酒不必疑惑，我叫前任首辅声爷爷，前任首辅叫我声侄孙。//Register multiple delegates for the event不做人生的旁观者——是《追光逐梦》的口号，也是本节目所要传达的理念，围绕“真实、青春、梦想、成长”的关键词，以最真实的镜头记录当下社会倍受关注的“小鲜肉”，通过对90后明星的贴身跟拍，展现他们的真实自我和生存状态，他们的压力与困惑，荣耀背后的努力与付出……为青少年追星树立健康榜样，传播青春追梦正能量。One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.