Navy Battle

package MultidimensionalArrays2;

import java.util.Scanner;

public class NavyBattle {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());

        String[][] matrix = new String[n][n];

        fillMatrix(matrix, scanner);

        int submarineRow = -1;
        int submarineCol = -1;
        int countHits = 0;
        int countCruiser = 0;

        for (int row = 0; row < n; row++) {
            for (int col = 0; col < n; col++) {
                if (matrix[row][col].equals("S")) {
                    submarineRow = row;
                    submarineCol = col;
                    break;
                }
            }
        }
        String command = scanner.nextLine();
        while (true) {
            matrix[submarineRow][submarineCol] = "-";
            if (command.equals("up")) {
                submarineRow--;
            } else if (command.equals("down")) {
                submarineRow++;
            } else if (command.equals("left")) {
                submarineCol--;
            } else if (command.equals("right")) {
                submarineCol++;
            }
            String submarinePosition = matrix[submarineRow][submarineCol];

            if (submarinePosition.equals("-")) {
                matrix[submarineRow][submarineCol] = "S";
            } else if (submarinePosition.equals("*")) {
                matrix[submarineRow][submarineCol] = "S";
                countHits++;

                if (countHits == 3) {
                    System.out.printf("Mission failed, U-9 disappeared! Last known coordinates [%d, %d]!%n",
                            submarineRow, submarineCol);
                    break;
                }
            } else if (submarinePosition.equals("C")) {
                matrix[submarineRow][submarineCol] = "S";
                countCruiser++;
                if (countCruiser == 3) {
                    System.out.println("Mission accomplished, U-9 has destroyed all battle cruisers of the enemy!");
                    break;
                }
            }
            command = scanner.nextLine();
        }
        printMatrix(matrix);
    }

    private static void fillMatrix(String[][] matrix, Scanner scanner) {
        for (int row = 0; row < matrix.length; row++) {
            matrix[row] = scanner.nextLine().split("");
        }
    }
    private static void printMatrix(String[][] matrix) {
        for (int row = 0; row < matrix.length; row++) {
            for (int col = 0; col < matrix.length; col++) {
                System.out.print(matrix[row][col]);
            }
            System.out.println();
        }
    }
}