division and write result into file

import java.io.*;

public class Main {
    public static void main(String[] args) {
        try(FileInputStream in = new FileInputStream("src\\task1\\input.txt");
            FileOutputStream out = new FileOutputStream("src\\task1\\output.txt"))
        {
            byte[] buffer = new byte[in.available()];
            in.read(buffer, 0, buffer.length);
            System.out.println("Input text: " + new String(buffer));
            //divide text into words
            String[] words = new String(buffer).split(" ");
            //check if only integers
            for (int i = 0; i < words.length; i++) {
                try {
                    Integer.parseInt(words[i]);
                } catch (NumberFormatException e) {
                    System.out.println("Not only integers");
                    return;
                }
            }
            //if number of arguments is not equal two
            if (words.length != 2) {
                System.out.println("Not two arguments");
                return;
            }

            //convert words to integers
            int[] numbers = new int[words.length];
            //check if the word is a number
            for (int i = 0; i < words.length; i++) {
                try {
                    numbers[i] = Integer.parseInt(words[i]);
                } catch (NumberFormatException e) {
                    System.out.println("The word " + words[i] + " is not a number");
                }
            }
            //check if second number is not zero
            if (numbers[1] == 0) {
                System.out.println("Division by zero");
            } else {
                //calculate the result
                int result = numbers[0] / numbers[1];
                //write the result to the file
                out.write(String.valueOf(result).getBytes());
                System.out.println("Result: " + result);
            }

        }
        //input file does not exist
        catch (FileNotFoundException e) {
            System.out.println("File not found");
        }
        //no write-permission for the output file
        catch (IOException e) {
            System.out.println("File can not be written");
        }
        finally {
            System.out.println("Program finished");
        }
    }
}