Write a program that demonstrates the skills we've learned throughout this quarter. This type of project offers only a few guidelines, allowing you to invest as much time and polish as you want, as long as you meet the program requirements described below. You can write a simple game (e. g., tic-tac-toe, Battleship), a simulation (e. g., a zero-dimensional energy balance model of the climate), or an application (e. g., a mortgage calculator). Your main requirement is that you demonstrate six of the following features in your software program and that you comment and document your code well:

This type of project offers only a few guidelines, allowing you to invest as much time and polish as you want, as long as you meet the program requirements described below.

The code given below is tic-tac-toe

Explanation:

import java.util.Arrays;

import java.util.InputMismatchException;

import java.util.Scanner;

public class TicTacToe {

static Scanner in;

static String [ ] board;

static String turn;

public static void main(String[] args) {

 in = new Scanner(System.in);

 board = new String[9];

 turn = "X";

 String winner = null;

 populateEmptyBoard();

 System.out.println("Welcome to 2 Player Tic Tac Toe.");

 System.out.println("");

 printBoard();

 System.out.println("X's will play first. Enter a slot number to place X in:");

while (winner == null) {

 int numInput;

 try {

   numInput = in.nextInt();

   if (!(numInput > 0 && numInput <= 9)) {

   System.out.println("Invalid input; re-enter slot number:");

   continue;

   }

 } catch (InputMismatchException e) {

   System.out.println("Invalid input; re-enter slot number:");

   continue;

 }

 if (board[numInput-1].equals(String.valueOf(numInput))) {

   board[numInput-1] = turn;

   if (turn.equals("X")) {

   turn = "O";

   } else {

   turn = "X";

   }

   printBoard();

   winner = checkWinner();

 } else {

   System.out.println("Slot already taken; re-enter slot number:");

   continue;

 }

 }

 if (winner.equalsIgnoreCase("draw")) {

 System.out.println("It's a draw! Thanks for playing.");

 } else {

 System.out.println("Congratulations! " + winner + "'s have won! Thanks for playing.");

 }

}

static String checkWinner() {

 for (int a = 0; a < 8; a++) {

 String line = null;

 switch (a) {

 case 0:

   line = board[0] + board[1] + board[2];

   break;

 case 1:

   line = board[3] + board[4] + board[5];

   break;

 case 2:

   line = board[6] + board[7] + board[8];

   break;

 case 3:

   line = board[0] + board[3] + board[6];

   break;

 case 4:

   line = board[1] + board[4] + board[7];

   break;

 case 5:

   line = board[2] + board[5] + board[8];

   break;

 case 6:

   line = board[0] + board[4] + board[8];

   break;

 case 7:

   line = board[2] + board[4] + board[6];

   break;

 }

 if (line.equals("XXX")) {

   return "X";

 } else if (line.equals("OOO")) {

   return "O";

 }

 }

 for (int a = 0; a < 9; a++) {

 if (Arrays.asList(board).contains(String.valueOf(a+1))) {

   break;

 }

 else if (a == 8) return "draw";

 }

 System.out.println(turn + "'s turn; enter a slot number to place " + turn + " in:");

 return null;

}

static void printBoard() {

 System.out.println("/---|---|---\\");

 System.out.println("| " + board[0] + " | " + board[1] + " | " + board[2] + " |");

 System.out.println("||");

 System.out.println("| " + board[3] + " | " + board[4] + " | " + board[5] + " |");

 System.out.println("||");

 System.out.println("| " + board[6] + " | " + board[7] + " | " + board[8] + " |");

 System.out.println("/---|---|---\\");

}

static void populateEmptyBoard() {

 for (int a = 0; a < 9; a++) {

 board[a] = String.valueOf(a+1);

 }

}

}

the answer will be d