import?java.awt.*;
import?java.awt.event.*;
import?java.io.*;
import?java.net.*;
import?java.text.SimpleDateFormat;
import?java.util.Date;

public?class?Talk?extends?frame?implements?Runnable{
	MulticastSocket?mSocket;
	TextArea?display;
	TextField?input;
	public?Talk（）{
		super（“聊天室“）;
		try{
			mSocket?=?new?MulticastSocket（1234）;
			InetAddress?inetAddress?=?InetAddress.getByName（“224.0.0.1“）;
			mSocket.joinGroup（inetAddress）;
		}
		catch（Exception?e1）{}
		display?=new?TextArea（540）;
		display.setEditable（false）;
		input?=?new?TextField（20）;
		add（“South“input）;
		add（“Center“display）;
		setSize（500400）;
		this.setLocation（200100）;
		setVisible（true）;
		input.addActionListener（new?ActionListener（）{
			public?void?actionPerformed（ActionEvent?e）{
				if（