Tic Tac Toe Game in Java

In this short tutorial, we will write a Java program to develop the Tic-Tac-Toe game. The Tic-Tac-Toe is a very common game that is fairly easy to play. The rules of the game are simple and well-known.
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In this tutorial, we are going to develop the console-based Tic Tac Toe game. In this game, the user is prompted to choose one of the nine squares in the grid. The grid chosen by the player is then shown by the corresponding sign of the player. The first player marks A and second player marks B.

Tic-Tac-Toe Game in Java

package net.javaguides.springboot;

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

/**
 * Tic-Tac-Toe game in Java
 * @author https://www.javaguides.net/
 *
 */
public class TicTacToe {

    private static String[] board = new String[9];
    private static String turn = "A";

    public static void main(String[] args) {

        String winner = null;
        populateEmptyBoard();

        System.out.println("Welcome to 2 Player Tic Tac Toe.");
        System.out.println("--------------------------------");
        printBoard();
        System.out.println("A's will play first. Enter a slot number to place A in:");

        try (Scanner in = new Scanner(System.in)) {
            while (winner == null) {
                int numInput;
                try {
                    numInput = in .nextInt();
                    if (!(numInput > 0 && numInput <= 9)) {
                        System.out.println("Invalid input; re-enter slot number:");
                        continue;
                    }
                } catch (InputMismatchException e) {
                    System.out.println("Invalid input; re-enter slot number:");
                    continue;
                }
                if (board[numInput - 1].equals(String.valueOf(numInput))) {
                    board[numInput - 1] = turn;
                    if (turn.equals("A")) {
                        turn = "B";
                    } else {
                        turn = "A";
                    }
                    printBoard();
                    winner = checkWinner();
                } else {
                    System.out.println("Slot already taken; re-enter slot number:");
                    continue;
                }
            }
            if (winner.equalsIgnoreCase("draw")) {
                System.out.println("It's a draw! Thanks for playing.");
            } else {
                System.out.println("Congratulations! " + winner + "'s have won! Thanks for playing.");
            }
        }
    }

    static String checkWinner() {
        for (int a = 0; a < 8; a++) {
            String line = null;
            switch (a) {
                case 0:
                    line = board[0] + board[1] + board[2];
                    break;
                case 1:
                    line = board[3] + board[4] + board[5];
                    break;
                case 2:
                    line = board[6] + board[7] + board[8];
                    break;
                case 3:
                    line = board[0] + board[3] + board[6];
                    break;
                case 4:
                    line = board[1] + board[4] + board[7];
                    break;
                case 5:
                    line = board[2] + board[5] + board[8];
                    break;
                case 6:
                    line = board[0] + board[4] + board[8];
                    break;
                case 7:
                    line = board[2] + board[4] + board[6];
                    break;
            }
            if (line.equals("AAA")) {
                return "A";
            } else if (line.equals("BBB")) {
                return "B";
            }
        }

        for (int a = 0; a < 9; a++) {
            if (Arrays.asList(board).contains(String.valueOf(a + 1))) {
                break;
            } else if (a == 8)
                return "draw";
        }

        System.out.println(turn + "'s turn; enter a slot number to place " + turn + " in:");
        return null;
    }

    private static void printBoard() {
        String createBoard = "/---|---|---\\ \n" + "| " + board[0] + " | " + board[1] + " | " + board[2] + " | \n" +
            "|-----------| \n" + "| " + board[3] + " | " + board[4] + " | " + board[5] + " | \n" +
            "|-----------| \n" + "| " + board[6] + " | " + board[7] + " | " + board[8] + " | \n" +
            "/---|---|---\\ \n";
        System.out.println(createBoard);
    }

    private static void populateEmptyBoard() {
        for (int a = 0; a < 9; a++) {
            board[a] = String.valueOf(a + 1);
        }
    }
}
Output:
Welcome to 2 Player Tic Tac Toe.
--------------------------------
/---|---|---\ 
| 1 | 2 | 3 | 
|-----------| 
| 4 | 5 | 6 | 
|-----------| 
| 7 | 8 | 9 | 
/---|---|---\ 

A's will play first. Enter a slot number to place A in:
1
/---|---|---\ 
| A | 2 | 3 | 
|-----------| 
| 4 | 5 | 6 | 
|-----------| 
| 7 | 8 | 9 | 
/---|---|---\ 

B's turn; enter a slot number to place B in:
2
/---|---|---\ 
| A | B | 3 | 
|-----------| 
| 4 | 5 | 6 | 
|-----------| 
| 7 | 8 | 9 | 
/---|---|---\ 

A's turn; enter a slot number to place A in:
4
/---|---|---\ 
| A | B | 3 | 
|-----------| 
| A | 5 | 6 | 
|-----------| 
| 7 | 8 | 9 | 
/---|---|---\ 

B's turn; enter a slot number to place B in:
5
/---|---|---\ 
| A | B | 3 | 
|-----------| 
| A | B | 6 | 
|-----------| 
| 7 | 8 | 9 | 
/---|---|---\ 

A's turn; enter a slot number to place A in:
7
/---|---|---\ 
| A | B | 3 | 
|-----------| 
| A | B | 6 | 
|-----------| 
| A | 8 | 9 | 
/---|---|---\ 

Congratulations! A's have won! Thanks for playing.

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