Two player Tic-Tac-Toe implementation in Java

TicTacToeGame.java

package matrix;

import java.util.Arrays;
import java.util.Scanner;

/**
 * TicTacToeGame
 */
public class TicTacToeGame {

    private char[][] board = new char[3][3];

    private static final String TERMINATE = "!";
    private static final char X = 'X';
    private static final char O = 'O';
    private static final int HORIZONTAL = 0;
    private static final int VERTICAL = 1;
    private static final int CROSS = 2;
    private static final int REVERSE_CROSS = 3;

    private boolean GAME_IN_PROGRESS = false;
    private boolean PLAYER_ONE_WON = false;
    private boolean PLAYER_TWO_WON = false;
    private boolean GAME_DRAWN = false;

    public TicTacToeGame() {
        System.out.println("@@@@@@@@@@@@@@@@@@@ Tic Tac Toe @@@@@@@@@@@@@@@@@@@@@@@@");
        for (int i = 0; i < board.length; i++) {
            Arrays.fill(board[i], '_');
        }
        System.out.println("\n**************** BOARD INITIALIZED *********************");
    }

    private void play() {
        Scanner in = new Scanner(System.in);
        boolean isPlayerOne = true;
        startGame();

        while (GAME_IN_PROGRESS && !(PLAYER_ONE_WON || PLAYER_TWO_WON || GAME_DRAWN)) {
            int[] input = getPlayerInput(isPlayerOne, in);
            if (input[0] == -1 || input[1] == -1) {
                continue;
            }

            char c = isPlayerOne ? X : O;
            if (!placeXO(input[0], input[1], c)) {
                continue;
            }

            printBoard();
            if (checkWinCondition(input[0], input[1], c)) {
                if (isPlayerOne) {
                    PLAYER_ONE_WON = true;
                } else {
                    PLAYER_TWO_WON = true;
                }
            } else if (checkForDraw()) {
                GAME_DRAWN = true;
            }

            isPlayerOne = !isPlayerOne;
        }

        showGameResults();
        endGame();
    }


    private boolean checkWinCondition(int row, int col, char check) {
        return (dfs(row, col, HORIZONTAL, check) == 3) ||
                (dfs(row, col, VERTICAL, check) == 3) ||
                (dfs(row, col, CROSS, check) == 3) ||
                (dfs(row, col, REVERSE_CROSS, check) == 3);
    }

    private boolean checkForDraw() {
        for (int i = 0; i < board.length; i++) {
            for (int j = 0; j < board[i].length; j++) {
                if (board[i][j] == '_') {
                    return false;
                }
            }
        }
        return true;
    }

    private int dfs(int row, int col, int dir, char check) {
        if (row < 0 || row >= board.length || col < 0 || col >= board[row].length || board[row][col] != check) {
            return 0;
        }
        char temp = board[row][col];
        board[row][col] = 'V';
        int res = 0;

        if (dir == HORIZONTAL) {
            res = 1 + dfs(row + 1, col, dir, check) + dfs(row - 1, col, dir, check);
        } else if (dir == VERTICAL) {
            res = 1 + dfs(row, col + 1, dir, check) + dfs(row, col - 1, dir, check);
        } else if (dir == CROSS) {
            res = 1 + dfs(row + 1, col + 1, dir, check) + dfs(row - 1, col - 1, dir, check);
        } else if (dir == REVERSE_CROSS) {
            res = 1 + dfs(row + 1, col - 1, dir, check) + dfs(row - 1, col + 1, dir, check);
        }

        board[row][col] = temp;
        return res;
    }

    private boolean placeXO(int row, int col, char c) {
        if (row >= 0 && row < board.length && col >= 0 && col < board[row].length && board[row][col] == '_') {
            board[row][col] = c;
            return true;
        }
        System.out.println("----------------Invalid board position-----------------");
        return false;
    }

    private void printBoard() {
        System.out.println("\n%%%%%%%%%%%%%%%%%%%%%%% BOARD %%%%%%%%%%%%%%%%%%%%%%%%%%%\n");
        for (int i = 0; i < board.length; i++) {
            for (int j = 0; j < board[i].length; j++) {
                System.out.print(String.valueOf(board[i][j]) + "\t");
            }
            System.out.println("\n");
        }
    }

    private void startGame() {
        GAME_IN_PROGRESS = true;
        System.out.println("\n<<<<<<<<<<< \"GAME STARTED. PRESS ! TO END.\" >>>>>>>>>>>>");
        System.out.println("\n========================================================");
    }

    private void showGameResults() {
        String gameResult = ((PLAYER_ONE_WON) ? "$$$$$$$$$$$$$$$$$ PLAYER ONE WINS! $$$$$$$$$$$$$$$$$$" :
                ((PLAYER_TWO_WON) ? "$$$$$$$$$$$$$$$$$ PLAYER TWO WINS! $$$$$$$$$$$$$$$$$$" :
                        "$$$$$$$$$$$$$$$$$ GAME ENDED IN A DRAW! $$$$$$$$$$$$$$$$$$"));

        System.out.println("\n" + gameResult);
    }

    private void endGame() {
        GAME_IN_PROGRESS = false;
        System.out.println("\n========================================================");
        System.out.println("\n<<<<<<<<<<<<<<<<<<< ENDING GAME >>>>>>>>>>>>>>>>>>>>>>>>");
        System.out.println("\n@@@@@@@@@@@@@@@@@@@@@ GOODBYE! @@@@@@@@@@@@@@@@@@@@@@@@@");
    }

    private int[] getPlayerInput(boolean isPlayerOne, Scanner in) {
        System.out.println("\n[Player " + (isPlayerOne ? "X" : "O")
                + "] ====> Enter your move [0-2][0-2]:");

        String input = in.nextLine();
        if (input.contains(TERMINATE)) {
            GAME_IN_PROGRESS = false;
            System.out.println("------------ \"!\" Pressed. Terminating Game. ------------");
        } else {
            String[] values = input.split(" ");
            if (values.length == 2) {
                try {
                    int row = Integer.parseInt(values[0]);
                    int col = Integer.parseInt(values[1]);
                    if (isValid(row) && isValid(col)) {
                        return new int[]{row, col};
                    }
                } catch (NumberFormatException e) {

                }
            }
            System.out.println("---------------------Invalid input----------------------");
            System.out.println("----------Enter input in the format [0-2] [0-2]---------");
        }
        return new int[]{-1, -1};
    }

    private boolean isValid(int pos) {
        return pos >= 0 && pos < 3;
    }

    public static void main(String[] args) {
        TicTacToeGame ticTacToeGame = new TicTacToeGame();
        ticTacToeGame.play();
    }
}