Java - 奇怪的目录问题？

Question

当我使用以下代码运行类时:

public static void main(String[] args)
{
    createDuplicateStructure("in", "out");
}

public static void createDuplicateStructure(String path_start, String path_result)
{
    File start = new File(path_start);
    File result = new File(path_result);
    duplicateDirectoryStructure(start, result);
}

public static void duplicateDirectoryStructure(File start_dir, File result_dir)
{
    //FileFilter used by listFiles(filter) - to make sure they are dirs
    FileFilter dirs_only = new FileFilter() 
            { 
                public boolean accept(File file){  return file.isDirectory();} 
            };
    File[] dir_contents = start_dir.listFiles(dirs_only);
    for(File dir : dir_contents)
    {
        File duplicate = new File(result_dir.getPath(), dir.getName());
        if(dir.mkdir())
        {
            duplicateDirectoryStructure(dir, duplicate);
        }
        else
        {
            System.out.println("ERROR: Unable to create dir! (" + duplicate.getPath() + ")");
        }
    }
}

我在控制台中得到这个:

 Error: Unable to create dir! (out/a)
 Error: Unable to create dir! (out/a)
 Error: Unable to create dir! (out/a)

目录"out"与.jar位于同一目录中.目录"in"包含"a","b"和"c"目录(用于测试).

任何想法为什么这不起作用？

谢谢!

Answer 1

您应该替换dir.mkdir()为duplicate.mkdir()因为dir是已存在的源目录.