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Event Handler: It consists of multiple callback methods, which constitute an application-related feedback mechanism for an event. There is no event handler mechanism in the Java NIO field for us to call or make callbacks, but we write our own code. Netty has made an upgrade in the role of event handler compared with Java NIO. It provides us developers with a large number of callback methods for us to implement corresponding callback methods for business logic processing when specific events are generated, namely ChannelHandler. The methods in ChannelHandler correspond to callbacks to each event.HebeiTwo years ago, family changes and bad marriage caused Mary to have a mild depressive reaction. But on the surface, Mary is more "happy" than before. "I just try my best to feel that I am very good and cannot let others know." Mary said. She covered up everything with a smile or positive energy expression, but her inner depression snowballed until the night two years later, when it completely collapsed.The combination mode pays attention to the unified interface and transforms the "one-to-many" relationship into the "one-to-one" relationship.成为成人也需要相应的资格？洋二和女朋友去看电影时，因为没有成人证而被关了起来，洋二被要求必须通过成人考试，否则就会被永久划上儿童的身份。（中居正広、広末涼子饰）The reason why there are so many comparisons between men and women is that human beings have only two types of men and women in terms of gender, which is also the premise that the visitor model can be implemented.　　两个男人 为了爱情学习责任的过程