Renomear um pasta

//pasta a ser renomeada
File renomear = new File("diretorio");
//novo nome
File renomeado = new File("novodiretorio")
//renomeando
renomear .renameTo(renomeado );

BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    System.out.print("Please enter the file or directory 
                       name which has to be Renamed : ");
    
                        String old_name = in.readLine(); 
    File oldfile = new File(old_name);
  
   
      if(!oldfile.exists())
{
  
      System.out.println("File or directory does not exist.");
  
    System.exit(0);

    }
   
    System.out.print("please enter the new file or directory name : ");
 
    String new_name = in.readLine();

    File newfile = new File(new_name);
  
    System.out.println("Old File or directory name : "+ oldfile);
    System.out.println("New File or directory name : "+ newfile);
    boolean Rename = oldfile.renameTo(newfile);
   

      if(!Rename)
{

      System.out.println("File or directory does not rename successfully.");

        System.exit(0);
  
  }
   
 else {

      System.out.println("File or directory rename is successfully.");

    }