Invert binary file - 2 - Practice Exercises Java

import java.util.*;
public class Main
{
	public static void main(String[] args)
	{
		String fileName;

		System.out.print("Enter the name of file to convert: ");
		fileName = new Scanner(System.in).nextLine();

		java.io.FileInputStream myFileReader = File.OpenRead(fileName);

		long size = myFileReader.getLength();

		byte[] data = new byte[size];
		myFileReader.read(data, 0, (int)size);
		myFileReader.close();

		java.io.FileOutputStream myFileWriter = File.Create(fileName + ".inv");

		for (long i = size - 1; i >= 0; i--)
		{
			myFileWriter.write(data[i]);
		}

		myFileWriter.close();
	}
}