Utility method - Pass a File or String?

Posted by James P. on Stack Overflow See other posts from Stack Overflow or by James P.
Published on 2010-05-09T00:18:40Z Indexed on 2010/05/09 0:38 UTC
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Here's an example of a utility method:

public static Long getFileSize(String fileString) {

    File file = new File(fileString);

    if (file == null || !file.isFile())
        return null;

    return file.length();
}

Is it a good practise to pass a String rather than a File to a method like this? In general what reasoning should be applied when making utility methods of this style?

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