I have no idea how to solve the task.

package com.codegym.games.minesweeper; import com.codegym.engine.cell.Color; import com.codegym.engine.cell.Game; import java.util.ArrayList; import java.util.List; public class MinesweeperGame extends Game { private static final int SIDE = 9; private GameObject[][] gameField = new GameObject[SIDE][SIDE]; private int countMinesOnField = 0; private int countFlags = 0; private static final String MINE = "\uD83D\uDCA3"; private static final String FLAG = "\uD83D\uDEA9"; private boolean isGameStopped; @Override public void initialize() { setScreenSize(SIDE, SIDE); createGame(); } private void createGame() { boolean isMine = false; isGameStopped = false; for (int x = 0; x < SIDE; x++) { for (int y = 0; y < SIDE; y++) { if (getRandomNumber(10) < 1) { isMine = true; countMinesOnField++; } gameField[x][y] = new GameObject(y, x, isMine); setCellColor(x, y, Color.RED); } } countFlags = countMinesOnField; countMineNeighbors(); } @Override public void onMouseLeftClick(int x, int y){ openTile(x, y); } public void onMouseRightClick(int x, int y){ markTile(x, y); } private ArrayList<GameObject> getNeighbors(GameObject cell) { ArrayList<GameObject> neighbourList = new ArrayList<GameObject>(); if (cell.x - 1 >= 0) { //row above if (cell.y - 1 >= 0) neighbourList.add(gameField[cell.x - 1][cell.y - 1]); neighbourList.add(gameField[cell.x - 1][cell.y]); if (cell.y + 1 < SIDE) neighbourList.add(gameField[cell.x - 1][cell.y + 1]); } if (cell.y - 1 >= 0) { //same row neighbourList.add(gameField[cell.x][cell.y - 1]); if (cell.y + 1 < SIDE) neighbourList.add(gameField[cell.x][cell.y + 1]); } if (cell.x + 1 < SIDE) { //row below if (cell.y - 1 >= 0) neighbourList.add(gameField[cell.x + 1][cell.y - 1]); neighbourList.add(gameField[cell.x + 1][cell.y]); if (cell.y + 1 < SIDE) neighbourList.add(gameField[cell.x + 1][cell.y + 1]); } return neighbourList; } private void countMineNeighbors() { for (int x = 0; x < SIDE; x++) { for (int y = 0; y < SIDE; y++) { if (!gameField[x][y].isMine) { for (GameObject z : getNeighbors(gameField[y][x])) { if (z.isMine == true) gameField[x][y].countMineNeighbors++; } } } } } private void openTile(int x, int y) { gameField[y][x].isOpen = true; setCellColor(x, y, Color.GREEN); // if (!gameField[y][x].isOpen){ // return; // } // else if (gameField[y][x].isFlag || gameField[y][x].isMine){ // return; // } // else if (isGameStopped == true){ // gameField[y][x].isOpen = false; // } if (gameField[y][x].isMine) { setCellValueEx(x, y, Color.RED, MINE); gameOver(); } else if (!gameField[y][x].isMine && gameField[y][x].countMineNeighbors >= 1) setCellNumber(x, y, gameField[y][x].countMineNeighbors); else if (gameField[y][x].isMine) { setCellValue(x, y, MINE); } else if (!gameField[y][x].isMine && gameField[y][x].countMineNeighbors == 0) { setCellValue(x, y, ""); getNeighbors(gameField[y][x]); int m = y, n = x; if (m - 1 >= 0 && m - 1 < SIDE) { if (!gameField[m - 1][n].isOpen) openTile(n, m - 1); if (n - 1 >= 0 && !gameField[m - 1][n - 1].isOpen) openTile(n - 1, m - 1); if (n + 1 < SIDE && !gameField[m - 1][n + 1].isOpen) openTile(n + 1, m - 1); } if (m >= 0 && m < SIDE) { if (n - 1 >= 0 && !gameField[m][n - 1].isOpen) openTile(n - 1, m); if (n + 1 < SIDE && !gameField[m][n + 1].isOpen) openTile(n + 1, m); } if (m + 1 >= 0 && m + 1 < SIDE) { if (!gameField[m + 1][n].isOpen) openTile(n, m + 1); if (n - 1 >= 0 && !gameField[m + 1][n - 1].isOpen) openTile(n - 1, m + 1); if (n + 1 < SIDE && !gameField[m + 1][n + 1].isOpen) openTile(n + 1, m + 1); } } } private void markTile(int x, int y) { GameObject gameObject = gameField[y][x]; if (gameObject.isOpen || (countFlags == 0 && !gameObject.isFlag)) { return; } if (gameObject.isFlag) { gameField[y][x].isFlag = false; countFlags++; setCellColor(x, y, Color.RED); setCellValue(x, y, ""); } else { gameField[y][x].isFlag = true; countFlags--; setCellColor(x, y, Color.BLUE); setCellValue(x, y, FLAG); } } private void gameOver() { isGameStopped = true; showMessageDialog(Color.RED, "GAME OVER" , Color.BLACK, 40); } }