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TicTacToeClient_2.java
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TicTacToeClient_2.java
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// Fig. 21.8: TicTacToeClient.java
// Client for the TicTacToe program
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
// Client class to let a user play Tic-Tac-Toe with
// another user across a network.
public class TicTacToeClient extends JApplet
implements Runnable {
private JTextField id;
private JTextArea display;
private JPanel boardPanel, panel2;
private Square board[][], currentSquare;
private Socket connection;
private DataInputStream input;
private DataOutputStream output;
private Thread outputThread;
private char myMark;
private boolean myTurn;
// Set up user-interface and board
public void init()
{
display = new JTextArea( 4, 30 );
display.setEditable( false );
getContentPane().add( new JScrollPane( display ),
BorderLayout.SOUTH );
boardPanel = new JPanel();
GridLayout layout = new GridLayout( 3, 3, 0, 0 );
boardPanel.setLayout( layout );
board = new Square[ 3 ][ 3 ];
// When creating a Square, the location argument to the
// constructor is a value from 0 to 8 indicating the
// position of the Square on the board. Values 0, 1,
// and 2 are the first row, values 3, 4, and 5 are the
// second row. Values 6, 7, and 8 are the third row.
for ( int row = 0; row < board.length; row++ )
{
for ( int col = 0;
col < board[ row ].length; col++ ) {
board[ row ][ col ] =
new Square( ' ', row * 3 + col );
board[ row ][ col ].addMouseListener(
new SquareListener(
this, board[ row ][ col ] ) );
boardPanel.add( board[ row ][ col ] );
}
}
id = new JTextField();
id.setEditable( false );
getContentPane().add( id, BorderLayout.NORTH );
panel2 = new JPanel();
panel2.add( boardPanel, BorderLayout.CENTER );
getContentPane().add( panel2, BorderLayout.CENTER );
}
// Make connection to server and get associated streams.
// Start separate thread to allow this applet to
// continually update its output in text area display.
public void start()
{
try {
connection = new Socket(
InetAddress.getByName( "127.0.0.1" ), 5000 );
input = new DataInputStream(
connection.getInputStream() );
output = new DataOutputStream(
connection.getOutputStream() );
}
catch ( IOException e ) {
e.printStackTrace();
}
outputThread = new Thread( this );
outputThread.start();
}
// Control thread that allows continuous update of the
// text area display.
public void run()
{
// First get player's mark (X or O)
try {
myMark = input.readChar();
id.setText( "You are player \"" + myMark + "\"" );
myTurn = ( myMark == 'X' ? true : false );
}
catch ( IOException e ) {
e.printStackTrace();
}
// Receive messages sent to client
while ( true ) {
try {
String s = input.readUTF();
processMessage( s );
}
catch ( IOException e ) {
e.printStackTrace();
}
}
}
// Process messages sent to client
public void processMessage( String s )
{
if ( s.equals( "Valid move." ) ) {
display.append( "Valid move, please wait.\n" );
currentSquare.setMark( myMark );
currentSquare.repaint();
}
else if ( s.equals( "Invalid move, try again" ) ) {
display.append( s + "\n" );
myTurn = true;
}
else if ( s.equals( "Opponent moved" ) ) {
try {
int loc = input.readInt();
board[ loc / 3 ][ loc % 3 ].setMark(
( myMark == 'X' ? 'O' : 'X' ) );
board[ loc / 3 ][ loc % 3 ].repaint();
display.append(
"Opponent moved. Your turn.\n" );
myTurn = true;
}
catch ( IOException e ) {
e.printStackTrace();
}
}
else
display.append( s + "\n" );
display.setCaretPosition(
display.getText().length() );
}
public void sendClickedSquare( int loc )
{
if ( myTurn )
try {
output.writeInt( loc );
myTurn = false;
}
catch ( IOException ie ) {
ie.printStackTrace();
}
}
public void setCurrentSquare( Square s )
{
currentSquare = s;
}
}
// Maintains one square on the board
class Square extends JPanel {
private char mark;
private int location;
public Square( char m, int loc)
{
mark = m;
location = loc;
setSize ( 30, 30 );
setVisible(true);
}
public Dimension getPreferredSize() {
return ( new Dimension( 30, 30 ) );
}
public Dimension getMinimumSize() {
return ( getPreferredSize() );
}
public void setMark( char c ) { mark = c; }
public int getSquareLocation() { return location; }
public void paintComponent( Graphics g )
{
super.paintComponent( g );
g.drawRect( 0, 0, 29, 29 );
g.drawString( String.valueOf( mark ), 11, 20 );
}
}
class SquareListener extends MouseAdapter {
private TicTacToeClient applet;
private Square square;
public SquareListener( TicTacToeClient t, Square s )
{
applet = t;
square = s;
}
public void mouseReleased( MouseEvent e )
{
applet.setCurrentSquare( square );
applet.sendClickedSquare( square.getSquareLocation() );
}
}