public String playListSize(Playlist pl) {
        ArrayList<Music> musicPl = getMusiclistFromPlaylist(pl.getMusics());
        long sizeInBytes,sizeInKb, total=0;
        for (Music m : musicPl) {
            String s = "c:\\APPGetPlay\\MyPlaylist\\";
            File f = new File(s+m.getMusicPath());
            try {
                sizeInBytes = Files.size(f.toPath());
                sizeInKb = sizeInBytes/(1024);
                total += sizeInKb;
            } catch (IOException ex) {
                Logger.getLogger(GetPlay.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
        return ""+total+" KB";
    }