File size in Java

import java.io.*;

public class FileSize {

public static void main(String[] args) {

//create file object
File file = new File("C://FileIO/demo.txt");

/*
* To get the size of a file, use
* long length() method of Java File class.
* This method returns size of a particular file in bytes. It returns 0L
* if file does not exists, and unspecified if file is a directory.
*/

long fileSize = file.length();

System.out.println("File size in bytes is: " + fileSize);

System.out.println("File size in KB is : " + (double)fileSize/1024);

System.out.println("File size in MB is :" + (double)fileSize/(1024*1024));

}

}