Comment obtenir la taille du fichier en Java

package com.example.file;

import java.io.File;

public class FileSizeExample
{
    public static void main(String[] args)
    {
        File file =new File("c:\\java_xml_logo.jpg");

        if(file.exists()){

            double bytes = file.length();
            double kilobytes = (bytes / 1024);
            double megabytes = (kilobytes / 1024);
            double gigabytes = (megabytes / 1024);
            double terabytes = (gigabytes / 1024);
            double petabytes = (terabytes / 1024);
            double exabytes = (petabytes / 1024);
            double zettabytes = (exabytes / 1024);
            double yottabytes = (zettabytes / 1024);

            System.out.println("bytes : " + bytes);
            System.out.println("kilobytes : " + kilobytes);
            System.out.println("megabytes : " + megabytes);
            System.out.println("gigabytes : " + gigabytes);
            System.out.println("terabytes : " + terabytes);
            System.out.println("petabytes : " + petabytes);
            System.out.println("exabytes : " + exabytes);
            System.out.println("zettabytes : " + zettabytes);
            System.out.println("yottabytes : " + yottabytes);
        }else{
             System.out.println("File does not exists!");
        }

    }
}

bytes : 13900.0
kilobytes : 13.57421875
megabytes : 0.013256072998046875
gigabytes : 1.2945383787155151E-5
terabytes : 1.2641976354643703E-8
petabytes : 1.234568003383174E-11
exabytes : 1.205632815803881E-14
zettabytes : 1.1773757966834775E-17
yottabytes : 1.1497810514487085E-20