In Eclipse, create a new Java project named TicTacToeGame. Define the package name to be tictactoegame. Add a single class also named TicTacToeGame.

Add the following variable and constant declarations to the TicTacToeGame class:

static int$[][]$ gameboard;

static final int EMPTY $=0$;

static final int NOUGHT $=-1$;

static final int CROSS $=1$;

Note: The variable gameboard is a two$-$dimensional int array. Think of it as a table with rows and columns, in which cells can be empty $(0)$ or contain a nought $(1)$ or cross $(1).$

The keywords static and final declare that the variable being defined is a constant. The value of a constant can$$t be changed. By convention, constant names are all uppercase. The constants EMPTY, NOUGHT, and CROSS will simplify your code.

Add the following $$utility$$ methods to the TicTacToeGame class:

$/*$ Set a square on the board must be empty $*/$

static void set$($int val, int row, int col$)$

throws IllegalArgumentException $\{$

if $($gameboard$[$row$][$col$]==$ EMPTY$)$

gameboard$[$row$][$col$]=$ val;

else throw new IllegalArgumentException

$("$Player already there!"$)$;

$\}$

$/*$ display the board $*/$

static void displayBoard$()\{$

for$($ int r $=0$; r $<$ gameboard.length; r$++)\{$

System.out.print$("|")$;

for $($int c $=0$; c $<$ gameboard$[$r$].$length; c$++)$

$\{$

switch$($gameboard$[$r$][$c$])\{$

case NOUGHT:

System.out.print$("$O$")$;

break;

case CROSS:

System.out.print$("$X$")$;

break;

default: $//$Empty

System.out.print$("")$;

$\}$

System.out.print$("|")$;

$\}$

System.out.println$("$

$-------")$;

$\}$

$\}$

Define a createBoard method to initialize the game board:

static void createBoard$($int rows, int cols$)\{$

$//$TODO Initialize the gameboard

$\}$

Define a winOrTie method. Check first for a win with rows and columns and then diagonally. Finally, check to see if there are any empty cells without a cross or naught.

static int winOrTie$()\{$

$//$TODO Determine whether X or O won or there is a tie

$\}$

Review the relevant sections of Chapter $5$ in your textbook to see how to initialize and iterate through a multidimensional array.

A player wins if all cells in a row, column, or diagonally are the same mark. The players tie if all cells have a mark but no player has three horizontal, vertical, or diagonal marks. Return NOUGHT if nought wins, CROSS if cross wins, $0$ if there$$s a tie, and another value $($like $2,$ for example$)$ if there are empty cells on the board.

In the main$()$ method, perform the following actions:

Create the board and initialize a turn counter, player value, and game outcome. For nought, the value is $1,$ while $1$ is the value for cross.

While there$$s no winner or tie, display the board and prompt for a row and column for the current player.

Use a try$-$catch block to handle the set method exception. Use the System.err.println$()$ method rather than the System.out.println$()$ method to output the exception. This will cause the message to be displayed in red.

Display the final board and a message stating which player won or if there$$s a tie.

When completed, the contents of the main$()$ method should resemble the following:

createBoard$(3,3)$;

int turn $=0$;

int playerVal;

int outcome;

java.util.Scanner scan $=$ new java.util.Scanner$($System$.$in$)$;

do $\{$

displayBoard$()$;

playerVal $=($turn $\%2==0)?$ NOUGHT : CROSS;

if $($playerVal $==$ NOUGHT$)$

System.out.println $("$

$$O$\text{'}$s turn$")$;

else System.out.println$("$

$$X$\text{'}$s turn$")$;

System.out.print$("$Enter row and column:" $)$;

try $\{$

set$($playerVal$,$ scan.nextInt$(),$ scan.nextInt$())$;

$\}$ catch $($Exception ex$)$

$\{$System$.$err.println$($ex$)$; turn$--$;$\}$

turn $1.++$;

outcome $=$ winOrTie$()$;

$\}$ while $($ outcome $==-2)$;

displayBoard$()$;

switch $($outcome$)\{$

case NOUGHT:

System.out.println$("$O wins!"$)$;

break;

case CROSS:

System.out.println$("$X wins!"$)$;

break;

case $0$:

System.out.println$("$Tie$.")$;

break;

$\}$

Compile and run the project to ensure it works as expected. Try a few games to verify all wins and ties are correctly detected.

When running, the program should produce output similar to the following in the console window. Note: if you need to expand the window, click on the Full$-$screen icon in the upper right corner. Click again to restore it$.$

$||||$

$-------$

$||||$

$-------$

$||||$

$-------$

$--$O$\text{'}$s turn$--$

Enter row and column:$00$

$|$O$|||$

$-------$

$||||$

$-------$

$||||$

$-------$

$--$X$\text{'}$s turn$--$

Enter row and column:$01$

$|$O$|$X$||$

$-------$

$||||$

$-------$

$||||$

$-------$

$--$O$\text{'}$s turn$--$

Enter row and column:$11$

$|$O$|$X$||$

$-------$

$||$O$||$

$-------$

$||||$

$-------$

$--$X$\text{'}$s turn$--$

Enter row and column:$20$

$|$O$|$X$||$

$-------$

$||$O$||$

$-------$

$|$X$|||$

$-------$

$--$O$\text{'}$s turn$--$

Enter row and column: $22$

$|$O$|$X$||$

$-------$

$||$O$||$

$-------$

$|$X$||$O$|$

$-------$

O wins!