The following is the tic-tac-toe game code:

Make sure the file name and the class name must be same otherwise the compiler error will occur in some IDE's

/************** Tic-Tac-Toe Game ************** 
 * Save As file TikTacToe.java ***************/

// Import statement
import java.util.*;

// Class name TikTacToe
public class TikTacToe
{
	// Declare array for game board
	static String[] gameBoard;
	
	// Create a string to store the player turns
	static String playerTurn;

	// This method is used to check the winner
	static String checkWinner()
	{
		// This for-loop is used to check the each cell in the game board
		for (int a = 0; a < 8; a++)
		{
			String eachRow = null;

			// Create a switch-statement to check each row
			switch (a)
			{
			case 0:
				eachRow = gameBoard[0] + gameBoard[1] + gameBoard[2];
				break;
			case 1:
				eachRow = gameBoard[3] + gameBoard[4] + gameBoard[5];
				break;
			case 2:
				eachRow = gameBoard[6] + gameBoard[7] + gameBoard[8];
				break;
			case 3:
				eachRow = gameBoard[0] + gameBoard[3] + gameBoard[6];
				break;
			case 4:
				eachRow = gameBoard[1] + gameBoard[4] + gameBoard[7];
				break;
			case 5:
				eachRow = gameBoard[2] + gameBoard[5] + gameBoard[8];
				break;
			case 6:
				eachRow = gameBoard[0] + gameBoard[4] + gameBoard[8];
				break;
			case 7:
				eachRow = gameBoard[2] + gameBoard[4] + gameBoard[6];
				break;
			}
			
			// Check for X winner
			if (eachRow.equals("XXX"))
			{
				return "X";
			}

			// check for O winner
			else if (eachRow.equals("OOO"))
			{
				return "O";
			}
		}

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


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


	// Display board
	static void printgameBoard()
	{
		System.out.println();
		System.out.println(" " + gameBoard[0] + " " + gameBoard[1] + " " + gameBoard[2] + " ");
		System.out.println(" " + gameBoard[3] + " " + gameBoard[4] + " " + gameBoard[5] + " ");

		System.out.println(" " + gameBoard[6] + " " + gameBoard[7] + " " + gameBoard[8] + " ");
		System.out.println();
	}

	// Create a main method to run the program.
	public static void main(String[] args)
	{
		Scanner in = new Scanner(System.in);
		gameBoard = new String[9];
		playerTurn = "X";
		String winner = null;

		for (int a = 0; a < 9; a++)
		{
			gameBoard[a] = String.valueOf(a + 1);
		}

		System.out.println("Welcome to Tic Tac Toe.");
		printgameBoard();

		System.out.println("X will play first. Enter a slot number to place X in:");

		while (winner == null)
		{
			int numInput;

			// Create a try-block to handle exceptions
			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;
			}

			// This game has two player x and O.
			// Create an if-statement to check the playerTurn.
			if (gameBoard[numInput - 1].equals(String.valueOf(numInput)))
			{
				gameBoard[numInput - 1] = playerTurn;

				if (playerTurn.equals("X"))
				{
					playerTurn = "O";
				} else
				{
					playerTurn = "X";
				}

				printgameBoard();
				winner = checkWinner();
			} else
			{
				System.out.println("Slot already taken; re-enter slot number:");
			}
		}

		// Check the game is draw or not.
		if (winner.equalsIgnoreCase("draw"))
		{
			System.out.println("It's a draw! Thanks for playing.");
		}

		// Display winner.
		else
		{
			System.out.println("Congratulations! " + winner + "'s have won! Thanks for playing.");
		}
	}
}

The following is output for the Tic-Tac-Toe Game:

Welcome to Tic Tac Toe.

 1 2 3 
 4 5 6 
 7 8 9 

X will play first. Enter a slot number to place X in:
9

 1 2 3 
 4 5 6 
 7 8 X 

O's playerTurn; enter a slot number to place O in:
1

 O 2 3 
 4 5 6 
 7 8 X 

X's playerTurn; enter a slot number to place X in:
7

 O 2 3 
 4 5 6 
 X 8 X 

O's playerTurn; enter a slot number to place O in:
8

 O 2 3 
 4 5 6 
 X O X 

X's playerTurn; enter a slot number to place X in:
3

 O 2 X 
 4 5 6 
 X O X 

O's playerTurn; enter a slot number to place O in:
5

 O 2 X 
 4 O 6 
 X O X 

X's playerTurn; enter a slot number to place X in:
6

 O 2 X 
 4 O X 
 X O X 

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