Frame um WindowClosing erweitern

Hallo NewsGroup,

ich möchte ein bestehendes Coding dahingehend erweitern,
dass das Schließen des Fensters (x oben rechts) ebenfalls unterstützt wird.

Wie müsste u.s. Coding erweitert werden?

package chat.sockets;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Label;
import java.awt.List;
import java.awt.Panel;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Vector;

public class Client
{
private ClientCommunicator communicator;
private String userName;
private Frame loginFrame, chatFrame;
private List userList;
private TextArea chatArea;
private TextField nameField, chatField;
private Button submitButton, logoutButton;


private void showLoginFrame() {
loginFrame = new Frame();
loginFrame.setLayout(new FlowLayout());

loginFrame.add(new Label("Name:"));

nameField = new TextField(20);
loginFrame.add(nameField);

Button loginButton = new Button("login");
loginButton.addMouseListener(new LoginListener());
loginFrame.add(loginButton);

loginFrame.pack();
loginFrame.setVisible(true);
}


private void showChatFrame() {
Panel usersPanel = new Panel();
usersPanel.setLayout(new BorderLayout());
usersPanel.add(new Label("Current users:"), BorderLayout.NORTH);
userList = new List(5, false);
usersPanel.add(userList, BorderLayout.SOUTH);

Panel chatPanel = new Panel();
chatPanel.setLayout(new BorderLayout());
chatPanel.add(new Label("Chat:"), BorderLayout.NORTH);
chatArea = new TextArea(10, 20);
chatPanel.add(chatArea, BorderLayout.SOUTH);

Panel ownPanel = new Panel();
ownPanel.setLayout(new BorderLayout());
ownPanel.add(new Label("What I want to say:"), BorderLayout.NORTH);
chatField = new TextField(20);
ownPanel.add(chatField, BorderLayout.CENTER);
Panel buttonsPanel = new Panel();
submitButton = new Button("submit");
submitButton.addMouseListener(new ChatListener());
buttonsPanel.add(submitButton);
logoutButton = new Button("logout");
logoutButton.addMouseListener(new ChatListener());
buttonsPanel.add(logoutButton);
ownPanel.add(buttonsPanel, BorderLayout.SOUTH);

chatFrame = new Frame();
chatFrame.setLayout(new BorderLayout());
chatFrame.add(usersPanel, BorderLayout.NORTH);
chatFrame.add(chatPanel, BorderLayout.CENTER);
chatFrame.add(ownPanel, BorderLayout.SOUTH);
chatFrame.pack();
chatFrame.setVisible(true);
}


private void fillUserList(Vector names) {
userList.removeAll();
for ( int i = 0; i < names.size(); i++ )
if (names.get(i).equals(userName) )
userList.add("<" + names.get(i) + ">");
else
userList.add(names.get(i) + " ");
}


public Client() {
communicator = new ClientCommunicator();
showLoginFrame();
}

public static void main(String[] args) {
new Client();
}

class LoginListener extends MouseAdapter {
public void mouseClicked(MouseEvent e) {
userName = nameField.getText();
communicator.login(userName);
loginFrame.dispose();
showChatFrame();
Poller thread = new Poller();
thread.start();
}
}

class ChatListener extends MouseAdapter {
public void mouseClicked(MouseEvent e) {
if ( e.getSource() == submitButton ) {
communicator.tell(userName, chatField.getText());
chatField.setText("");
}
else if ( e.getSource() == logoutButton ) {
communicator.logout(userName);
}
}
}


class Poller extends Thread
{
public void run() {
boolean finished = false;
ChatEvent evt = null;

while (!finished)
{
try {
Thread.sleep(100); // Verzögern wegen CPU-Belastung
}
catch (InterruptedException e)
{ }

evt = communicator.poll(userName);

if ( evt != null ) {
switch (evt.getCommand()) {
case ChatEvent.LIST_UPDATE:
fillUserList((Vector) evt.getArg());
break;
case ChatEvent.MESSAGE:
chatArea.append((String) evt.getArg() + "\n");
break;
case ChatEvent.LOGOUT:
finished = true;
break;
}
}
}
communicator.stop();
System.exit(0);
} // run

} // Poller

} // Client

Besten Dank vorab!
Ciao, Alberto

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