You could easily just open up the Fixnum class and add a method to print a bar of the appropriate length, as in Listing 3.

您可以打开fixnum类，并添加一个方法来打印出相应长度的柱，如清单3所示。

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Next up is instance behavior: I want my User instances to support the ability to list all retweets in order of influence, which means I need to add another method.

接下来是实例行为：我希望我的User实例支持按影响力顺序列出所有转贴的能力，这意味着我需要添加另一个方法。

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The example looks up the add method chain.

本例查找add方法链。

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