Java nätverksprogrammering

import java.awt.event.*;
import javax.swing.*;
import java.net.*;
import java.io.*;

public class Chat implements ActionListener, KeyListener, Runnable {
	private JTextArea show;
	private JTextField write;
	private Player player;

	private Thread thread = new Thread(this);
	private int port;
	private MulticastSocket so;
	private InetAddress ina;

	/**
	* Creates a new Chat with the specific {@link JTextArea} and {@link JTextField}.
	* @param show A {@link JTextArea} that is used in class {@link ChatArea} to show messages
	* @param write A {@link JTextField} that is used in class {@link ChatArea} to write messages
	* @see ChatArea
	*/
	public Chat(JTextArea show, JTextField write, Player player, MulticastSocket so, InetAddress ina, int port) {
		this.show = show;
		this.write = write;
		this.player = player;
		this.so = so;
		this.ina = ina;
		this.port = port;

		try {
			so = new MulticastSocket(port);
			ina = InetAddress.getByName("234.235.236.238");
			so.joinGroup(ina);
			thread.start();
			send("Connected");
		}
		catch(IOException e) {
			System.out.println(e);
		}
	}

	public void run() {
		byte[] data = new byte[1024];
		while(true) {
			try {
				DatagramPacket packet = new DatagramPacket(data, data.length);
				so.receive(packet);
				String message = new String(data, 0, packet.getLength());
				show.append(message);
			}
			catch (IOException e){
				break;
			}
		}
	}

	/**
	* Changes the text in {@link JTextArea} and remove text in {@link JTextField}
	*/
	public void send(String s) {
		byte[] data = (player.getName() + ": " + s + "\n").getBytes();
		DatagramPacket packet = new DatagramPacket(data, data.length, ina, port);
		try {
			so.send(packet);
		}
		catch(IOException e)	{
			System.out.println(e);
		}
	}
}