Question

(Tic-Tac-Toe) Create a class Tic-Tac-Toe that will enable you to write a program to play Tic-Tac-Toe. The class contains a private 3-by-3 two-dimensional array. Use an enumeration to represent the value in each cell of the array. The enumeration’s constants should be named X, O and EMPTY (for a position that does not contain an X or an O). The constructor should initialize the board elements to EMPTY. Allow two human players. Wherever the first player moves, place an X in the specified square, and place an O wherever the second player moves. Each move must be to an empty square. After each move, determine whether the game has been won and whether it’s a draw. Also, allow the player to specify whether he or she wants to go first or second.

Answer 1

Solution:

Code:

Output:

Copyable Code:

import java.util.Scanner;

//Class

class GameTicTacToe

{

private value[][] brd;

private value crntPlayer;

public enum value

{

EMPTY, X, O

}

public GameTicTacToe(int player)

{

brd = new value[3][3];

if(player == 1)

crntPlayer = value.X;

else

crntPlayer = value.O;

initializebrd();

}

//Initialize the board

public void initializebrd() {

for (int i = 0; i < 3; i++) {

for (int j = 0; j < 3; j++) {

brd[i][j] = value.EMPTY;

}

}

}

public char getPlayer(){

return changeValue(crntPlayer);

}

public char changeValue(value v)

{

if (v == value.EMPTY)

{

return '-';

}

else if (v == value.X)

{

return 'X';

}

else

{

return 'O';

}

}

//Method definition

public void writeBoard()

{

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

for (int i = 0; i < 3; i++)

{

System.out.print("| ");

for (int j = 0; j < 3; j++)

{

System.out.print(changeValue(brd[i][j]) + " | ");

}

System.out.println();

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

}

}

//Method definition

public boolean isBoardFull()

{

for (int i = 0; i < 3; i++)

{

for (int j = 0; j < 3; j++)

{

if (brd[i][j] == value.EMPTY)

{

return false;

}

}

}

return true;

}

//Method definition

public boolean isWin() {

return (isRowsWin() || isColumnWin() || isDiagonalWin());

}

//Method definition

private boolean isRowsWin() {

for (int i = 0; i < 3; i++)

{

if (checkRowCol(brd[i][0], brd[i][1], brd[i][2]) == true)

{

return true;

}

}

return false;

}

//Method definition

private boolean isColumnWin()

{

for (int i = 0; i < 3; i++)

{

if (checkRowCol(brd[0][i], brd[1][i], brd[2][i]) == true)

{

return true;

}

}

return false;

}

//Method definition

private boolean isDiagonalWin()

{

return ((checkRowCol(brd[0][0], brd[1][1], brd[2][2]) == true)

|| (checkRowCol(brd[0][2], brd[1][1], brd[2][0]) == true));

}

//Method definition

private boolean checkRowCol(value brd2, value brd3, value brd4)

{

return ((brd2 != value.EMPTY) && (brd2 == brd3) && (brd3 == brd4));

}

//Method definition

public void changePlayer()

{

if (crntPlayer == value.X)

{

crntPlayer = value.O;

}

else

{

crntPlayer = value.X;

}

}

//Method definition

public void writeMark(int row, int col)

{

brd[row][col] = crntPlayer;

}

}

//Main class

public class Main {

//Object for input

public static Scanner in = new Scanner(System.in);

//Method definition

public static int getChoice()

{

while(true)

{

System.out.println("1. X takes first turn");

System.out.println("2. O takes first turn");

System.out.print("Please make a choice: ");

int ch = in.nextInt();

if(ch == 1 || ch == 2){

return ch;

}

else{

System.out.println("Invalid choice. try again!!");

}

}

}

//Main method

public static void main(String[] args){

int ch = getChoice(), row, col;

GameTicTacToe t = new GameTicTacToe(ch);

t.writeBoard();

while(true){

System.out.println("Player " + t.getPlayer() + "'s turn");

System.out.print("Row index: ");

row = in.nextInt();

System.out.print("Column index: ");

col = in.nextInt();

t.writeMark(row, col);

t.writeBoard();

if(t.isWin()){

System.out.println(t.getPlayer() + " has won");

break;

}

else if(t.isBoardFull()){

System.out.println("Draw");

break;

}

t.changePlayer();

}

}

}