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TicTacToeServer.java
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TicTacToeServer.java
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// This class maintains a game of Tic-Tac-Toe for two
// client applets.
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
public class TicTacToeServer extends JFrame {
private byte board[];
private boolean xMove;
private JTextArea output;
private Player players[];
private ServerSocket server;
private int currentPlayer;
public TicTacToeServer() {
super("Tic-Tac-Toe Server");
board = new byte[9];
xMove = true;
players = new Player[2];
currentPlayer = 0;
// set up ServerSocket
try {
server = new ServerSocket(5000, 2);
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
}
output = new JTextArea();
getContentPane().add(output, BorderLayout.CENTER);
output.setText("Server awaiting connections\n");
setSize(300, 300);
show();
}
// wait for two connections so game can be played
public void execute() {
for (int i = 0; i < players.length; i++) {
try {
players[i] = new Player(server.accept(), this, i);
players[i].start();
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
}
}
// Player X is suspended until Player O connects.
// Resume player X now.
synchronized (players[0]) {
players[0].threadSuspended = false;
players[0].notify();
}
}
public void display(String s) {
output.append(s + "\n");
}
// Determine if a move is valid.
// This method is synchronized because only one move can be
// made at a time.
public synchronized boolean validMove(int loc, int player) {
boolean moveDone = false;
while (player != currentPlayer) {
try {
wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
if (!isOccupied(loc)) {
board[loc] = (byte) (currentPlayer == 0 ? 'X' : 'O');
currentPlayer = (currentPlayer + 1) % 2;
players[currentPlayer].otherPlayerMoved(loc);
notify(); // tell waiting player to continue
return true;
} else
return false;
}
public boolean isOccupied(int loc) {
if (board[loc] == 'X' || board[loc] == 'O')
return true;
else
return false;
}
public boolean gameOver() {
// Place code here to test for a winner of the game
return false;
}
public static void main(String args[]) {
TicTacToeServer game = new TicTacToeServer();
game.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
game.execute();
}
}
// Player class to manage each Player as a thread
class Player extends Thread {
private Socket connection;
private DataInputStream input;
private DataOutputStream output;
private TicTacToeServer control;
private int number;
private char mark;
protected boolean threadSuspended = true;
public Player(Socket s, TicTacToeServer t, int num) {
mark = (num == 0 ? 'X' : 'O');
connection = s;
try {
input = new DataInputStream(connection.getInputStream());
output = new DataOutputStream(connection.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
}
control = t;
number = num;
}
public void otherPlayerMoved(int loc) {
try {
output.writeUTF("Opponent moved");
output.writeInt(loc);
} catch (IOException e) {
e.printStackTrace();
}
}
public void run() {
boolean done = false;
try {
control.display("Player " + (number == 0 ? 'X' : 'O') + " connected");
output.writeChar(mark);
output.writeUTF("Player " + (number == 0 ? "X connected\n" : "O connected, please wait\n"));
// wait for another player to arrive
if (mark == 'X') {
output.writeUTF("Waiting for another player");
try {
synchronized (this) {
while (threadSuspended)
wait();
}
} catch (InterruptedException e) {
e.printStackTrace();
}
output.writeUTF("Other player connected. Your move.");
}
// Play game
while (!done) {
int location = input.readInt();
if (control.validMove(location, number)) {
control.display("loc: " + location);
output.writeUTF("Valid move.");
} else
output.writeUTF("Invalid move, try again");
if (control.gameOver())
done = true;
}
connection.close();
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
}
}
}