Hello, I\'m suppose to write a class (and a client class to test it) that encasu

ID: 3794290 • Letter: H

Question

Hello, I'm suppose to write a class (and a client class to test it) that encasulates a tic-tac-toe board. A tic-tac-toe board looks like a table of three rows and three columns partially or completely filled with the characters X and O. At some point, a cell of that table could be empty or could contain an X or an O. I should have one instance variable, a two-dimensional array of values representing the tic-tac-toe board.

The game shoudl involve the user vs. the computer. At the start of each game, randomly select if the computer will play X or O and who (i.e. human or computer) will make the first move.

My default constructor should instantiate the array so that it represents an empty board.

The following methods should be included:

*a method that generates a valid play by the computer and displays the board after each play.

*a method that requests a valid play from the human and displays the board after each play.

*a method to display the tic-tac-toe board. A method checking if a player has won based on the contents of the board; thsi method takes no parameter. It returns X if the

"X player" has won, O if the "O player" has won, T if the game was a tie. A player wins if he or she has placed an X (or an O) in all cells in a row, all cells in a column, or all cells in one of the diagonals.

NOTE: Be sure to display the board after each move. You must provide clear prompts for the human player to select a space on the tic-tac-toe board.

Input Validation: Verify that all moves by the human player are to a valid space on the tic-tac-toe board. An incorrect choice should not halt or terminate the game.

Below is my program which is a work in progress. Can you try to remodify it and lable comments? Thank you!

import java.util.Scanner;
public class LeavinesTicTacToe
{
public static void main(String[] args)
{
Scanner console = new Scanner (System.in);

Game ticTacToe = new Game();

String n = "no";
System.out.println("~~~Tic Tac Toe~~~");
System.out.println("Would you like to play? y/n");
String playerAnswer = console.nextLine();
while(!playerAnswer.equals(n))
{
ticTacToe.play();
System.out.println("Thanks for playing");
System.out.println("Would you like to play again? Press any key for yes, type no if you don't ");
playerAnswer=console.nextLine();
}
}
}
class Game
{
private final int empty = 0;
private final int player = 1;
private final int com = 2;
private final int size = 3;
private int[][] board;

public static void resetBoard(char[][] brd)
{
for (int i = 0; i < brd.length; i++)
for (int j = 0; j < brd[0].length; j++)
brd[i][j] = ' ';
}

public static void showBoard(char[][] brd)
{
int numRow = brd.length;
int numCol = brd[0].length;

System.out.println();

// First write the column header
System.out.print(" ");
for (int i = 0; i < numCol; i++)
System.out.print(i + " ");
System.out.print(' ');

System.out.println(); // blank line after the header

// The write the table
for (int i = 0; i < numRow; i++) {
System.out.print(i + " ");
for (int j = 0; j < numCol; j++) {
if (j != 0)
System.out.print("|");
System.out.print(" " + brd[i][j] + " ");
}

System.out.println();

if (i != (numRow - 1)) {
// separator line
System.out.print(" ");
for (int j = 0; j < numCol; j++) {
if (j != 0)
System.out.print("+");
System.out.print("---");
}
System.out.println();
}
}
System.out.println();
}

public void clear()
{
int col;
int row;
board = new int[size][size];
for (row = 0; row < size; row ++)
{
for (col = 0; col < size; col ++)
{
board[row][col] = empty;
}
}
}

public void computerMove()
{
int col;
int row;
int count;
int select;
count = 0;
for (row = 0; row < size; row ++)
for (col = 0; col < size; col ++)
if (board[row][col] == empty)
count ++;
select = (int) (Math.random() * count);
count = 0;
for (row = 0; row < size; row ++)
{
for (col = 0; col < size; col ++)
{
if (board[row][col] == empty)
{
if (count == select)
{
board[row][col] = com;
System.out.println("The computer selects row" + (row+1) + " column " + (col+1) + ".");
}
count ++;
}
}
}
}

public void playerMove()
{
Scanner console = new Scanner (System.in);
boolean a;
int col;
int row;
a = true;
while (a)
{
System.out.println("What is your move? Select a row number from 1 to " + size + " and a column number from 1 to " + size + ".");
row = console.nextInt();
col = console.nextInt();
if ((row < 1) || (row > size) || (col < 1) || (col > size))
{
System.out.println("Invalid choice, row " + row + " or column " + col + " must be from 1 to " + size + ".");
}
else
{
row --;
col --;
if (board[row][col] != empty)
{
System.out.println("That spot is already filled");
printScreen();
}
else
{
board[row][col] =player;
a = false;
}
}
}
}

public boolean checkWinner()
{
int col;
int row;
int count;
int win;
win = empty;
for (row = 0; row < size; row ++)
{
count = 0;
if (board[row][0] != empty)
for (col = 0; col < size; col ++)
if (board[row][0] == board[row][col])
count ++;
if (count == size)
win = board[row][0];
}
for (col = 0; col < size; col ++)
{
count = 0;
if (board[0][col] != empty)
for (row = 0; row < size; row ++)
if (board[0][col] == board[row][col])
count ++;
if (count == size)
win = board[0][col];
}
count = 0;
if (board[0][0] != empty)
for (row = 0; row < size; row ++)
if (board[0][0] == board[row][row])
count ++;
if (count == size)
win = board[0][0];
count = 0;
if (board[0][size-1] != empty)
for (row = 0; row < size; row ++)
if (board[0][size-1] == board[row][size-row-1])
count ++;
if (count == size)
win = board[0][size-1];
if (win != empty)
{
if (win == player)
System.out.println("Congratz you won");
else if(win == 3)
System.out.println("you lost");
return true;
}
count = 0;
for (row = 0; row < size; row ++)
for (col = 0; col < size; col ++)
if (board[row][col] == empty)
count ++;
if (count == 0)
{
System.out.println("Its a tie!");
return true;
}
return false;
}

public void play()
{
boolean e;
clear();
e=false;
while (!e)
{
printScreen();
playerMove();
printScreen();
e = checkWinner();
if (!e)
{
computerMove();
e = checkWinner();
if (e)
printScreen();
}
}
}
}

Explanation / Answer

import java.util.Scanner;
public class LeavinesTicTacToe
{
public static void main(String[] args)
{
Scanner console = new Scanner (System.in);

Game ticTacToe = new Game();

public static void resetBoard(char[][] brd)
{
for (int i = 0; i < brd.length; i++)
for (int j = 0; j < brd[0].length; j++)
brd[i][j] = ' ';
}

public static void showBoard(char[][] brd)
{
int numRow = brd.length;
int numCol = brd[0].length;

System.out.println();

// First write the column header
System.out.print(" ");
for (int i = 0; i < numCol; i++)
System.out.print(i + " ");
System.out.print(' ');

System.out.println(); // blank line after the header

// The write the table
for (int i = 0; i < numRow; i++) {
System.out.print(i + " ");
for (int j = 0; j < numCol; j++) {
if (j != 0)
System.out.print("|");
System.out.print(" " + brd[i][j] + " ");
}

System.out.println();

public void clear()
{
int col;
int row;
board = new int[size][size];
for (row = 0; row < size; row ++)
{
for (col = 0; col < size; col ++)
{
board[row][col] = empty;
}
}
}

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