java.io.File中的createNewFile（）方法抛出IOException，而同一类中的mkdir（）却没有，这是有原因的吗？
因为java.io类的设计非常糟糕。API几乎没有一致性。
这很烦人，也很不幸，但在使用这些方法时，您必须仔细阅读javadocs，以了解它们在具体情况下的行为。
您可以期待JDK7，它有一个全新的文件处理API。
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