Java.io之FileReader与FileWriter

FileReader与FileWriter都是convenience class

参考阅读

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A "convenience method" or "convenience class" generally means a class 
that doesn't do anything itself, but provides simplified access to
other classes or groups of classes. For example, the "random()" method
in java.lang.Math is a convenience method that provides a simple way to
use the more powerful java.util.Random class.
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