import java.io.*;
import java.util.Random;

class Swipe {
    // This method is purely for demonstrating a use case of 'throws' specification.
    public static void writeBytes(FileOutputStream os, byte[] data) throws IOException {
        os.write(data);        
    }

    public static void main(String[] args) throws IOException {
        FileOutputStream os = null;
        try {
            os = new FileOutputStream(args[0]);
            Random r = new Random();
            byte[] data = new byte[Integer.parseInt(args[1])];
            r.nextBytes(data);
            writeBytes(os, data);
        } catch (FileNotFoundException e) {
            System.out.println("Not a file!");
        } finally {
            if (os != null)
                os.close();
        }
    }
}