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6. Cao ZaixianAlthough the above code can meet the requirements, it is not easy to expand and difficult to read. If I want one or two conditions in the future, if I want to recharge 300 yuan successfully, I can win the 150 yuan red envelope, then I have to change the code inside at this time, so the coupling between business logic and code is relatively high, and I accidentally correct the wrong code. At this time, we try to use the responsibility chain mode to transfer objects in turn to realize it.周三太爷说四弟这一支算是落根在小青山了。Public void method () {金英光在剧中饰演突然变成洪娜丽（秀爱 饰）的年下男新爸爸的高南吉，虽然拥有神秘的过去，但却是一个会为了保护洪娜丽妈妈留下的饺子店和女儿洪娜丽而不顾危险的男子汉角色。说话间，红椒已经来到第一个靖军面前。Generally speaking, a delegate is a class that maintains a field inside and points to a method. Events can be regarded as variables of one delegate type, and multiple delegates or methods are cancelled through event registration. This article uses delegate and event execution methods to understand the difference between the two.