Inverted file

import java.io.*;

public class ReverseFile {
    public static void main(String[] args) {
        String inputFileName = "app.exe";
        String outputFileName = "app.inv";

        try (FileInputStream inputFile = new FileInputStream(inputFileName);
             FileOutputStream outputFile = new FileOutputStream(outputFileName)) {

            long fileSize = new File(inputFileName).length();
            byte[] data = new byte[(int) fileSize];
            inputFile.read(data);

            for (long i = fileSize - 1; i >= 0; i--) {
                outputFile.write(data[(int) i]);
            }

            System.out.println("File reversed successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}