有段代码有些疑问

[GoogleCodeExporter]

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public FSQueue(String dir, int fileLimitLength) throws Exception {
        this.fileLimitLength = fileLimitLength;
        File fileDir = new File(dir);
        if (fileDir.exists() == false && fileDir.isDirectory() == false) {
            if (fileDir.mkdirs() == false) {
                throw new IOException("create dir error");
            }
        }
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问题：如果dir是一个已经存在的文件路径，如“E:/a/b.txt”；�
��么就会有问题！抛出
“java.io.IOException: 系统找不到指定的路径。”

Original issue reported on code.google.com by kehan201...@gmail.com on 1 Dec 2011 at 5:10