Java solution to detecting mismatched numbers in a file

/*
Written by MD Harrington
Java solution to deal with these types of questions


EG

Look for another number apart from 709

709  709     709     709     709     709     709     709     709     709
709  709     709     709     709     709     709     709     709     709
709  709     709     709     709     709     709     709     709     709
709  709     709     709     709     709     709     709     709     709
709  409     709     709     709     709     609     709     709     709
709  509     709     709     709     709     709     709     709     709
709  709     678     709     709     509     709     709     709     709
209  709     609     709     709     709     709     709     709     709
709  709     709     709     709     709     709     709     709     709
709  709     709     709     709     709     709     709     709     709
709  709     709     409     709     709     709     709     775     709
709  709     709     709     709     709     709     709     709     709
709  709     709     709     709     809     709     709     709     709
709  709     709     409     709     709     709     709     709     709
709  709     709     709     709     709     709     709     709     709
709  508     709     709     709     709     709     709     709     609
709  709     209     709     709     709     709     709     709     709
209  709     709     709     709     709     709     709     709     709
709  709     609     709     709     709     709     709     709     709
709  709     709     709     709     709     709     309     709     709



 */

Here is the solution to this in java


package filetoarray;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Arrays;

public class FileToArray {
    private int[][] array;

    public FileToArray(String filePath) {
        try {
            // Open and read the file
            BufferedReader br = new BufferedReader(new FileReader(filePath));

            // Create a 2D array to store the numbers
            array = new int[20][10];

            // Read and parse the numbers from the file
            String line = br.readLine();
            String[] numbers = line.split("\\s+"); // Assuming numbers are separated by spaces

            for (int i = 0; i < 20; i++) {
                for (int j = 0; j < 10; j++) {
                    array[i][j] = Integer.parseInt(numbers[i * 10 + j]);
                }
            }

            // Close the file
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void compareAndPrintMismatches(int selectedNumber) {
        // Compare each number in the array
        for (int row = 0; row < 20; row++) {
            for (int col = 0; col < 10; col++) {
                int number = array[row][col];
                if (number != selectedNumber) {
                    System.out.println("Mismatch: Row " + (row + 1) + ", Column " + (col + 1) + " - Value: " + number);
                }
            }
        }
    }

    public int countElements() {
        int count = 20 * 10;
        return count;
    }

    public void exportToFile(String outputPath, String delimiter) {
        try {
            FileWriter writer = new FileWriter(outputPath);

            for (int row = 0; row < 20; row++) {
                String rowString = Arrays.toString(array[row]).replace(",", delimiter);
                writer.write(rowString.substring(1, rowString.length() - 1) + "\n");
            }

            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        String inputFilePath = "numbers.txt"; // Change this to the path of your input file
        FileToArray fileToArray = new FileToArray(inputFilePath);

        // Define the number to compare against
        int selectedNumber = 709; // Change this to the number you want to compare

        // Call the function to compare and print mismatches
        fileToArray.compareAndPrintMismatches(selectedNumber);

        // Call the function to count the number of elements
        int elementCount = fileToArray.countElements();
        System.out.println("Total number of elements in the array: " + elementCount);

        String outputFilePath = "output.txt"; // Change this to the desired output file path
        String delimiter = "\t"; // Change this to the desired delimiter
        fileToArray.exportToFile(outputFilePath, delimiter);
    }
}