Java obtains the folder size, file size, and number of files.

Package Tony;

Import java. Io. file;
Import java. Text. decimalformat;
Import java. Io. fileinputstream;

Public class getfilesize
{
   Public longgetfilesizes (file F) throws exception {// get the file size
       Long S = 0;
       If (F. exists ()){
           Fileinputstream FCM = NULL;
           FS = new fileinputstream (f );
          S = FCM. Available ();
       } Else {
           F. createnewfile ();
           System. Out. println ("file does not exist ");
       }
       Return S;
   }
   // Recursion
   Public longgetfilesize (file F) throws exception // get the folder size
   {
       Long size = 0;
       File flist [] = f. listfiles ();
       For (INT I = 0; I <flist. length; I ++)
       {
           If (flist [I]. isdirectory ())
           {
               Size = size + getfilesize (flist [I]);
           } Else
           {
               Size = size + flist [I]. Length ();
           }
       }
       Return size;
   }

   Publicstring formetfilesize (long files) {// convert the file size
       Decimalformat df = new decimalformat ("#. 00 ");
       String filesizestring = "";
       If (Files <1024 ){
           Filesizestring = DF. Format (double) files) + "B ";
       } Else if (Files <1048576 ){
           Filesizestring = DF. Format (double) files/1024) + "K ";
       } Else if (Files <1073741824 ){
           Filesizestring = DF. Format (double) files/1048576) + "M ";
       } Else {
           Filesizestring = DF. Format (double) files/1073741824) + "G ";
       }
       Return filesizestring;
   }
   
   Public longgetlist (file F) {// recursively calculates the number of directory files
       Long size = 0;
       File flist [] = f. listfiles ();
       Size = flist. length;
       For (INT I = 0; I <flist. length; I ++ ){
           If (flist [I]. isdirectory ()){
               Size = size + getlist (flist [I]);
               Size --;
           }
       }
       Return size;

 

  }
   
   Publicstatic void main (string ARGs [])
   {
       Getfilesize G = new getfilesize ();
       Long starttime = system. currenttimemillis ();
       Try
       {
           Long L = 0;
           String Path = "C :\\ windows ";
           File FF = new file (PATH );
           If (FF. isdirectory () {// if the path is a folder
               System. Out. println ("number of files         "+ G. getlist (ff ));
               System. Out. println ("directory ");
               L = G. getfilesize (ff );
               System. Out. println (path + "directory size:" + G. formetfilesize (l ));
           } Else {
               System. Out. println ("   Number of Files         1 ");
               System. Out. println ("file ");
               L = G. getfilesizes (ff );
               System. Out. println (path + "file size:" + G. formetfilesize (l ));