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Class TicTacToeimport java.util.*;/*** A class modelling a tic-tac-toe (noughts and crosses, Xs and Os) game.** @author Lynn Marshall* @version November 8, 2012*/public class TicTacToe{public static final String PLAYER_X = “X”; // player using “X”public static final String PLAYER_O = “O”; // player using “O”public static final String EMPTY = ” “; // empty cellpublic static final String TIE = “T”; // game ended in a tieprivate String player; // current player (PLAYER_X or PLAYER_O)private String winner; // winner: PLAYER_X, PLAYER_O, TIE, EMPTY = in progressprivate int numFreeSquares; // number of squares still freeprivate String board[][]; // 3×3 array representing the board/*** Constructs a new Tic-Tac-Toe board.*/public TicTacToe(){board = new String[3][3];}/*** Sets everything up for a new game. Marks all squares in the Tic Tac Toe board as empty,* and indicates no winner yet, 9 free squares and the current player is player X.*/private void clearBoard(){for (int i = 0; i < 3; i++) {for (int j = 0; j < 3; j++) {board[i][j] = EMPTY;}}winner = EMPTY;numFreeSquares = 9;player = PLAYER_X; // Player X always has the first turn.}/*** Plays one game of Tic Tac Toe.*/public void playGame(){int row, col;Scanner sc;clearBoard(); // clear the board// print starting boardprint();// loop until the game endswhile (winner==EMPTY) { // game still in progress// get input (row and column)while (true) { // repeat until valid inputSystem.out.print("Enter row and column of chosen square (0, 1, 2 for each): ");sc = new Scanner(System.in);row = sc.nextInt();col = sc.nextInt();if (row>=0 && row<=2 && col>=0 && col<=2 && board[row][col]==EMPTY) break;System.out.println("Invalid selection, try again.");}board[row][col] = player; // fill in the square with playernumFreeSquares--; // decrement number of free squares// see if the game is overif (haveWinner(row,col))winner = player; // must be the player who just wentelse if (numFreeSquares==0)winner = TIE; // board is full so it's a tie// print current boardprint();// change to other player (this won't do anything if game has ended)if (player==PLAYER_X)player=PLAYER_O;elseplayer=PLAYER_X;}}/*** Returns true if filling the given square gives us a winner, and false* otherwise.** @param int row of square just set* @param int col of square just set** @return true if we have a winner, false otherwise*/private boolean haveWinner(int row, int col){// unless at least 5 squares have been filled, we don't need to go any further// (the earliest we can have a winner is after player X's 3rd move).if (numFreeSquares>4) return false;// Note: We don’t need to check all rows, columns, and diagonals, only those// that contain the latest filled square. We know that we have a winner// if all 3 squares are the same, as they can’t all be blank (as the latest// filled square is one of them).// check row “row”if ( board[row][0].equals(board[row][1]) &&board[row][0].equals(board[row][2]) ) return true;// check column “col”if ( board[0][col].equals(board[1][col]) &&board[0][col].equals(board[2][col]) ) return true;// if row=col check one diagonalif (row==col)if ( board[0][0].equals(board[1][1]) &&board[0][0].equals(board[2][2]) ) return true;// if row=2-col check other diagonalif (row==2-col)if ( board[0][2].equals(board[1][1]) &&board[0][2].equals(board[2][0]) ) return true;// no winner yetreturn false;}/*** Prints the board to standard out using toString().*/public void print(){// something needs to be added here}/*** Returns a string representing the current state of the game. This should look like* a regular tic tac toe board, and be followed by a message if the game is over that says* who won (or indicates a tie).** @return String representing the tic tac toe game state*/public String toString(){return “”; // this needs to be updated}}Class TicTacToeFrameimport java.util.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;/*** A class modelling a tic-tac-toe (noughts and crosses, Xs and Os) game in a very* simple GUI window.** @author Lynn Marshall* @version November 8, 2012*/public class TicTacToeFrame extends TicTacToe{private JTextArea status; // text area to print game status/*** Constructs a new Tic-Tac-Toe board and sets up the basic* JFrame containing a JTextArea in a JScrollPane GUI.*/public TicTacToeFrame(){// add the necessary code here}/*** Prints the board to the GUI using toString().*/public void print(){// add code here}}

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