File splitter

import java.io.*;

public class FileSplitter {
    public static void main(String[] args) {
        final int BUFFER_SIZE = 5 * 1024;
        byte[] data = new byte[BUFFER_SIZE];

        int bytesRead;
        int fileCount = 1;

        String inputFileName = "app";
        String fileExtension = ".exe";

        try (FileInputStream inputFile = new FileInputStream(inputFileName + fileExtension)) {
            do {
                bytesRead = inputFile.read(data, 0, BUFFER_SIZE);

                if (bytesRead > 0) {
                    String outputFileName = inputFileName + "-" + String.format("%02d", fileCount);
                    try (FileOutputStream outputFile = new FileOutputStream(outputFileName)) {
                        outputFile.write(data, 0, bytesRead);
                        fileCount++;
                    }
                }
            } while (bytesRead == BUFFER_SIZE);

            System.out.println("Files split successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}