Java IO Files yan dosya adları değiştirilemiyor

import java.util.*;

import java.io.*;

import java.nio.file.Files;

public class project4 {



    public static void main(String[] args) {

        Scanner scan= new Scanner(System.in);

        System.out.print("Please enter a file name:");

        String fileName=scan.nextLine();

   

   

        File f= new File(fileName);

        scan.close();

       ArrayList<File> files= getSubFoldersandFiles(f);

       files.remove(f);

        System.out.println(f.getName()+" "+getFolderSize(f));

        for(File folder: files) {

       

                System.out.println(folder.getName()+" "

        +getFolderSize(folder));

           

                f.renameTo(new File(folder.getAbsolutePath(),clearTurkishChars(folder.getName())));

        }

       

   

   

        }



    public static String clearTurkishChars(String str) {

   

          String ret =str.toUpperCase(Locale.ENGLISH);

            char[] turkishChars = new char[] {0x131, 0x130, 0xFC, 0xDC, 0xF6, 0xD6, 0x15F, 0x15E, 0xE7, 0xC7, 0x11F, 0x11E};

            char[] englishChars = new char[] {'i', 'I', 'u', 'U', 'o', 'O', 's', 'S', 'c', 'C', 'g', 'G'};

            for (int i = 0; i < turkishChars.length; i++) {

                ret = ret.replaceAll(new String(new char[]{turkishChars}), new String(new char[]{englishChars}));

            }

            return ret;

           

        }

    public static long getFolderSize(File folder)

    {

        long length = 0;

        if(!folder.isDirectory()) {

            length+=folder.length();

        }

     

        else {

        File[] files = folder.listFiles();

 

        int count = files.length;

 

        // loop for traversing the directory

        for (int i = 0; i < count; i++) {

            if (files.isFile()) {

                length += files.length();

            }

            else {

                length += getFolderSize(files);

            }

        }

        }

        return length;

    }

   

   

    static ArrayList<File> getSubFoldersandFiles(File f) {

        Queue<File> q = new LinkedList<>();

        q.add(f);

        ArrayList<File> res = new ArrayList<>();

       

        while(!q.isEmpty()) {

            File cur = q.remove();

            if(cur.isDirectory()) {

                res.add(cur);

                for(File ch: cur.listFiles()) {

                    q.add(ch);

                }

            }

            else

                res.add(cur);

           

           

        }

        System.out.println("");

        return res;

    }

   

}

import java.io.File;

public class Main {
    public static void main(String[] args) throws Exception {
        File aDirectory = new File(/* Main folder */);
        renameDirectories(aDirectory);
    }

    private static void renameDirectories(File currentPath) throws Exception {
        for (File aFile : currentPath.listFiles()) {
            if (aFile.isDirectory()) {
                renameDirectories(aFile);
                if (/* Condition */)
                    aFile.renameTo(new File(aFile.getParent(), /* New name */));
            }
        }
    }
}