Java read matrix

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class Matrix {

    public static void main(String[] args) {

        if (args.length != 1) {
            System.err.println("Usage: java Matrix <matrix.txt>");
            System.exit(1);
        }

        String matrix[][] = new String[10][10];
        Scanner scanner = null;

        try {

            scanner = new Scanner(new File(args[0]));
            int lineNr = 0;

            while (scanner.hasNext()) {

                String[] line = scanner.nextLine().split(" ");
                for (int col = 0; col < line.length; col++) {
                    matrix[lineNr][col] = line[col];
                }
                lineNr++;

            }

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            assert scanner != null;
            scanner.close();
        }

        printMatrix(matrix);

    }

    private static void printMatrix(String[][] matrix) {

        for (String[] aMatrix : matrix) {
            for (int col = 0; col < aMatrix.length; col++) {
                System.out.print(aMatrix[col]);
                if (col != aMatrix.length - 1) {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }

    }

}