无法删除我在Java中重命名的目录中的文件？

Question

今天我正在乱搞java.io.File方法,偶然发现了一些奇怪的东西.

当我重命名目录时,我似乎无法删除文件或新目录.

    File dir = new File("dir");
    dir.mkdir();

    File file = new File(dir, "afile.txt");
    file.createNewFile();

    File newname = new File(dir, "newName.txt");
    file.renameTo(newname);

    File newdir = new File("newdir");
    dir.renameTo(newdir);

    System.out.println("file exists? " + file.exists());
    System.out.println("file deleted? " + file.delete());
    System.out.println("newname exists? " + newname.exists());
    System.out.println("deleted newname? " + newname.delete());
    System.out.println("dir exists? " + dir.exists());
    System.out.println("dir deleted? " + dir.delete());
    System.out.println("newdir exists? " + newdir.exists());
    System.out.println("deleted newdir? " + newdir.delete());

产量输出:

    file exists? false
    file deleted? false
    newname exists? false
    deleted newname? false
    dir exists? false
    dir deleted? false
    newdir exists? true
    deleted newdir? false

但是在文件系统中,newdir和newname.txt都存在!

但是,如果我注释掉目录的重命名,则删除工作正常.

是否需要了解delete()和rename()之间的其他规则？javadoc并不多.

Answer 1

我没有看到输出有任何问题:

1. 在重命名的结束,只是 newdir/和newdir/newName.txt存在.因此,前六行输出应该是false,它们是.(特别是,newname变量仍然引用dir/newName.txt,不再存在.)

2. newdir确实存在; 你的输出证实了这一点.

3. 最后一个delete()不起作用,因为目录不为空.

总之,一切看起来都像人们期望的那样完美.