Tic Tac Toe Kata

gistfile1.md

Tic Tac Toe Kata

The rules of the tic tac toe game are the following:

• a game is over when all fields are taken
• a game is over when all fields in a column are taken by a player
• a game is over when all fields in a row are taken by a player
• a game is over when all fields in a diagonal are taken by a player
• a player can take a field if not already taken
• players take turns taking fields until the game is over
• there are two player in the game (X and O)

`import java.util.Scanner;

public class SG {

static String[] tictactoe;
static boolean winner = false;

public static void main(String[] args) {
	int i = 0;
	tictactoe = new String[9];
	int playerInput;
	String turn = "";
	Scanner in = new Scanner(System.in);
	setTicTacToe();
	displayTicTacToe();
	System.out.println("Turn of X : ");
	while (!winner) {
		System.out.println(turn);
		playerInput = in.nextInt();
		if (playerInput >= 1 && playerInput <= 9) {
			i++;
			if (i % 2 != 0) {
				tictactoe[playerInput - 1] = "X";
				turn = "Turn of Y : ";
			} else if (i % 2 == 0) {
				tictactoe[playerInput - 1] = "O";
				turn = "Turn of X : ";
			}
			displayTicTacToe();
			checkWinner();
		} else {
			System.out.println("wrong number");
		}
	}
}

static void checkWinner() {
	String check = "";
	for (int i = 0; i < 9; i++) {
		check = "";
		switch (i) {
		case 0:
			check = tictactoe[0] + tictactoe[1] + tictactoe[2];
			break;
		case 1:
			check = tictactoe[3] + tictactoe[4] + tictactoe[5];
			break;
		case 2:
			check = tictactoe[6] + tictactoe[7] + tictactoe[8];
			break;
		case 3:
			check = tictactoe[0] + tictactoe[3] + tictactoe[6];
			break;
		case 4:
			check = tictactoe[1] + tictactoe[4] + tictactoe[7];
			break;
		case 5:
			check = tictactoe[2] + tictactoe[5] + tictactoe[8];
			break;
		case 6:
			check = tictactoe[0] + tictactoe[4] + tictactoe[8];
			break;
		case 7:
			check = tictactoe[2] + tictactoe[4] + tictactoe[6];
			break;
		}
		if (check.equals("XXX")) {
			System.out.println("X win the game !!");
			winner = true;
		} else if (check.equals("OOO")) {
			System.out.println("O win the game !!");
			winner = true;
		}
	}
}

static void setTicTacToe() {
	for (int i = 0; i < 9; i++) {
		tictactoe[i] = String.valueOf(i + 1);
	}
}

static void displayTicTacToe() {
	System.out.println("|-- |-- |-- |");
	System.out.println("| " + tictactoe[0] + " | " + tictactoe[1] + " | " + tictactoe[2] + " |");
	System.out.println("|-- |-- |-- |");
	System.out.println("| " + tictactoe[3] + " | " + tictactoe[4] + " | " + tictactoe[5] + " |");
	System.out.println("|-- |-- |-- |");
	System.out.println("| " + tictactoe[6] + " | " + tictactoe[7] + " | " + tictactoe[8] + " |");
	System.out.println("|-- |-- |-- |");
}

}`