java file sizes by recursively statistics

The idea is for non-directory files in a folder by traversing the file size statistics, and the same directory where the file traversal operation, as follows:

package word;

import java.io.File;
import java.io.FileNotFoundException;



public class Aa {
    
    static  iong Numb = 0; // total size
   
    public  static  void main (String [] args) throws a FileNotFoundException {
         // A method of automatically generating stubs TODO
        
        

        
        Path String = "C: \\ File";         // to traverse the path 
        File file = new new File (path);         // get its file objects 
        fil (file);
        
        System.out.println(numb);
        
    }

    public static void  fil(File a) throws FileNotFoundException
    {
        String path =a.getPath();
        File File = new new File (path);         // get its file object 
        File [] FS = File.listFiles ();     // traverse the files and directories under the path, on the File array 
        for (File F: FS) {                     / / traverse file [] array 
            IF (! f.isDirectory ())         // if not directory (ie files), be traversed 
            {
            Numb + = f.length (); // Get File Size}
             the else {FIL (F);
            }
                
            }
        }
   }