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TicTacToe.java

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import java.util.*;

class TicTacToe

{

static Scanner in;

static String[] board;

static String turn;

public static void main(String[] args)

{

in = new Scanner(System.in);

board = new String[9];

turn = "X";

String winner = null;

populateEmptyBoard(); // create empty board for game

System.out.println("Welcome to 2 Player Tic Tac Toe.");

System.out.println("--------------------------------\n");

printBoard();

System.out.println();

System.out.println("X's will play first. \nEnter a slot number to place X in:");

while (winner == null)

{

int numInput;

try {

numInput = in.nextInt();

if (!(numInput > 0 && numInput <= 9))

{

System.out.println("Invalid input; re-enter slot number:");

System.out.println();

continue;

}

} catch (InputMismatchException e) {

System.out.println("Invalid input; re-enter slot number:");

System.out.println();

continue;

}

if (board[numInput-1].equals(String.valueOf(numInput)))

{

board[numInput-1] = turn;

if (turn.equals("X"))

{

turn = "O";

}

else

{

turn = "X";

}

printBoard();

winner = checkWinner(); //check for winning condition of game

}

else

{

System.out.println("Slot already taken; re-enter slot number:");

System.out.println();

continue;

}

}

if (winner.equalsIgnoreCase("draw"))

{

System.out.println("It's a draw! Thanks for playing.");

System.out.println();

}

else

{

System.out.println("Congratulations! " + winner + "'s have won! Thanks for playing.");

System.out.println();

}

}

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("XXX"))

{

return "X";

}

else if (line.equals("OOO"))

{

return "O";

}

}

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; \nEnter a slot number to place " + turn + " in:");

return null;

}

static void printBoard()

{

System.out.println("\t\t\t /---|---|---\\");

System.out.println("\t\t\t | " + board[0] + " | " + board[1] + " | " + board[2] + " |");

System.out.println("\t\t\t |-----------|");

System.out.println("\t\t\t | " + board[3] + " | " + board[4] + " | " + board[5] + " |");

System.out.println("\t\t\t |-----------|");

System.out.println("\t\t\t | " + board[6] + " | " + board[7] + " | " + board[8] + " |");

System.out.println("\t\t\t /---|---|---\\");

System.out.println();

}

static void populateEmptyBoard()

{

for (int a = 0; a < 9; a++)

{

board[a] = String.valueOf(a+1);

}

}

}