Write a class called TicTacToe to handle the basics of a two-player game of Tic-Tac-Toe. The required methods are below. You may add any additional methods you believe would aid the user of your class to play the game.

Instance Variables

-board

-a two-dimensional array of chars

-turns

-an integer keeping track of the number of turns played this game

Constructors

-TicTacToeClass()

the default constructor, which just creates the two-dimensional array and fills each slot with ' ' (a blank space) and initializes the other attributes

Accessors

-int getTurns()

returns the numbers of turns played so far

-char getPlayerAt( int r, int c )

returns the character representing the piece at the given location. Should return either ' ', 'X', or 'O'.

-String toString()

returns the string representation of the current board

-boolean isTied()

returns true if all nine spaces are filled AND neither X nor O has won

-boolean isWinner(char p)

returns true if the letter passed in currently has three in a row. That is, isWinner('X') will return true if X has won, and isWinner('O') will return true if O has won

-boolean isFull()

returns true if nine turns have been played and false otherwise

-boolean isValid( int r, int c )

returns true if the given row and column corresponds to a valid space on the board

Modifiers

-void playMove(char p, int r, int c)

allows the given player to place their move at the given row and column. The row and column numbers are 0-based, so valid numbers are 0, 1, or 2

A game in progress (example)

 X O O X X X O 'O', choose your location (row, column): 0 1 X O O O X X X O 'X', choose your location (row, column): 2 0 X O O O X X X X O The game is a tie.

Files Needed

PlayTicTacToe.java a main program to play TicTacToe (V3.2) (BELOW)

package tictactoe;
	import java.util.Scanner;
	public class PlayTicTacToe {
	private static void playGame(Scanner keyboard) {
	char p = 'X';
	TicTacToe ttt = new TicTacToe();
	int r, c;
	do {
	System.out.println(ttt);
	do {
	System.out.print("'" + p + "', choose your location (row, column): ");
	try {
	r = keyboard.nextInt();
	c = keyboard.nextInt();
	if (!ttt.isValid(r, c))
	System.out.println("That is not a valid location. Try again.");
	else if (ttt.playerAt(r, c) != ' ')
	System.out.println("That location is already full. Try again.");
	else
	break;
	}
	catch (Exception e) {
	System.out.println("Bad Integer Entered. Try Again.");
	keyboard.nextLine(); //IMPORTANT! Clear keyboard!!!
	}
	} while (true);
	ttt.playMove(p, r, c);
	if (p == 'X')
	p = 'O';
	else
	p = 'X';
	} while (!ttt.isWinner('X') && !ttt.isWinner('O') && !ttt.isFull());
	System.out.println(ttt);
	String status;
	if (ttt.isWinner('X'))
	status = "X is the winner!";
	else if (ttt.isWinner('O'))
	status = "O is the winner!";
	else
	status = "The game is a tie.";
	status += " After " + ttt.getTurns() + " plays.";
	System.out.println(status);
	}
	// **********************************************
	private static void process(Scanner sc, String args[]) {
	playGame(sc);
	sc.nextLine(); // IMPORTANT!! Reset Scanner
	}
	// **********************************************
	private static boolean doThisAgain(Scanner sc, String prompt) {
	System.out.print(prompt);
	String doOver = sc.nextLine();
	return doOver.equalsIgnoreCase("Y");
	}
	// **********************************************
	public static void main(String args[]) {
	final String TITLE = "Play Tic Tac Toe V1.0";
	final String CONTINUE_PROMPT = "Play again? [y/N] ";
	System.out.println("Welcome to " + TITLE);
	Scanner sc = new Scanner(System.in);
	do {
	process(sc, args);
	} while (doThisAgain(sc, CONTINUE_PROMPT));
	sc.close();
	System.out.println("Thank you for using " + TITLE);
	}
	}