The programs in Figs. 27.13Â and 27.15Â implemented a multithreaded, client/se

Question

The programs in Figs. 27.13 and 27.15 implemented a multithreaded, client/server version of the game of Tic-Tac-Toe. Our goal in developing this game was to demonstrate a multithreaded server that could process multiple connections from clients at the same time. The server in the example is really a mediator between the two client appletsâ€â€it makes sure that each move is valid and that each client moves in the proper order. The server does not determine who won or lost or whether there was a draw. Also, there’s no capability to allow a new game to be played or to terminate an existing game.

Modify the TicTacToeServer class to test for a win, loss or draw after each move. Send a message to each client that indicates the result of the game when the game is over.

Modify the TicTacToeClient class to display a button that when clicked allows the client to play another game. The button should be enabled only when a game completes. Both class TicTacToeClient and class TicTacToeServermust be modified to reset the board and all state information. Also, the other TicTacToeClient should be notified that a new game is about to begin so that its board and state can be reset.

Modify the TicTacToeClient class to provide a button that allows a client to terminate the program at any time. When the user clicks the button, the server and the other client should be notified. The server should then wait for a connection from another client so that a new game can begin.

Modify the TicTacToeClient class and the TicTacToeServer class so that the winner of a game can choose game piece X or O for the next game. Remember: X always goes first.

If you’d like to be ambitious, allow a client to play against the server while the server waits for a connection from another client.

Explanation / Answer

import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.io.*; import java.util.*; public class TicTacToe implements ActionListener { final String VERSION = "1.0"; //Setting up ALL the variables JFrame window = new JFrame("Tic-Tac-Toe " + VERSION); JMenuBar mnuMain = new JMenuBar(); JMenuItem mnuNewGame = new JMenuItem("New Game"), mnuInstruction = new JMenuItem("Instructions"), mnuExit = new JMenuItem("Exit"), mnuAbout = new JMenuItem("About"); JButton btn1v1 = new JButton("Player vs Player"), btn1vCPU = new JButton("Player vs CPU"), btnBack = new JButton("

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