Alternative Classes with Different Interfaces
异曲同工的类( Alternative Classes with Different Interfaces ):两个函数做同一件事，但名字不同，使用Rename Method。不是很懂p114
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Alternative Class with Different Interface
... Middle Man (中间转手人) Alternative Class with Different Interface (异曲同工的类) Incomplete Library Class (不完美的程序库类) ...
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