import java.io.File;public class DeleteUtils{    public static void main(String[] args)    {        File dir = new File("D:\\code\\NCE\\Spliter_NCE");        renameDirRecursively(dir);        System.out.println("renameDirRecursively success");        deleteRecursively(dir);        System.out.println("deleteRecursively success");    }    private static void renameDirRecursively(File dir)    {        File[] listFiles = dir.listFiles();        if (listFiles != null)        {            int subIndex = 0;            for (File file : listFiles)            {                boolean isDir = file.isDirectory();                StringBuilder afterName = new StringBuilder();                subIndex = renameFile(file, subIndex, afterName);                if (isDir)                {                    renameDirRecursively(new File(afterName.toString()));                }            }        }    }    private static int renameFile(File file, int index, StringBuilder afterName)    {        String newName = file.getParent() + File.separator + index;        if (afterName != null)        {            afterName.append(newName);        }        if (newName.equals(file.getAbsolutePath()))        {            return index + 1;        }        boolean success = file.renameTo(new File(newName));        if (success)        {            return index + 1;        }        else        {            return renameFile(file, index + 1, afterName);        }    }    private static void deleteRecursively(File file)    {        if (file.isDirectory())        {            File[] listFiles = file.listFiles();            if (listFiles != null)            {                for (File subFile : listFiles)                {                    deleteRecursively(subFile);                }            }            file.delete();        }        else        {            file.delete();        }    }}