Komunikator Java do rozmowy między komputerami z wykorzystaniem adresów IP

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import java.applet.Applet;
import java.io.*;
import java.net.*;

public class JavaTalker extends Applet
{
boolean server;
int port = 500;
Socket sock;
String host = null;

public void parseArgs(String args[])
{
int i=0;
while (i < args.length)
{
if (args[i].equals("-port"))
{
port = Integer.valueOf(args[i+1]).intValue();
i+=2;
}
else if (args[i].equals("-server"))
{
server = true;
i++;
}
else if (i != args.length-1)
{
System.out.println("Uzycie:");
System.out.println(" (server) JavaTalker [-port port] [-server]");
System.out.println(" (klient) JavaTalker [-port port] [hostname]");
System.exit(0);
}
else
{
host = args[i];
i++;
}
}
}
public static void main(String args[])
{
new JavaTalker(args);
}

public JavaTalker(String args[])
{
parseArgs(args);
if (server)
server();
else client();
}




public void busyWait(DataInputStream inStream)
{
try
{
while (inStream.available() <= 0)
{
Thread.currentThread().sleep(100);
}
}
catch (InterruptedException e)
{
System.out.println(e.getMessage());
}
catch (IOException e)
{
System.out.println(e.getMessage());
}
}


public void server()
{
try
{
InetAddress serverAddr = InetAddress.getByName(null);
System.out.println("Czekam na polaczenie na maszynie " +
serverAddr.getHostName() + " na porcie " + port + "." );
ServerSocket serverSock = new ServerSocket(port,50);
sock = serverSock.accept();
System.out.println( "Przyjalem polaczenie z "+
sock.getInetAddress().getHostName()+".");
new JavaTalkerWriter(this).start();
new JavaTalkerReader(this).start();
}
catch (IOException e)
{
System.out.println(e.getMessage()+" blad polaczenia z klientem.");
}
}

public void client()
{
try
{
InetAddress serverAddr = InetAddress.getByName(host);
sock = new Socket(serverAddr.getHostName(), port, true);
System.out.println("Polaczenie z serverem " + serverAddr.getHostName() +
" na porcie " + sock.getPort() + ".");

new JavaTalkerWriter(this).start();
new JavaTalkerReader(this).start();
}
catch (IOException e)
{
System.out.println(e.getMessage() + ":Brak polaczenia z serverem.");
}
}
}

class JavaTalkerReader extends Thread
{
JavaTalker talker;

public JavaTalkerReader(JavaTalker talker)
{
this.talker = talker;
}

public synchronized void run()
{
try
{
DataInputStream userIn = new DataInputStream(System.in);
DataOutputStream remoteOut = new DataOutputStream(talker.sock.getOutputStream());
while (true)
{
talker.busyWait(userIn);
remoteOut.writeChars(userIn.readLine() + '\n');
}
}
catch (IOException e)
{
System.out.println(e.getMessage());
System.out.println(": Polaczenie zerwane." );
}
}
}

class JavaTalkerWriter extends Thread
{
JavaTalker talker;

public JavaTalkerWriter( JavaTalker talker )
{
this.talker = talker;
}

public synchronized void run()
{
try
{
DataInputStream remoteIn = new DataInputStream(talker.sock.getInputStream());
while (true)
{
talker.busyWait(remoteIn);
System.out.println(remoteIn.readLine());
}
}
catch (IOException e)
{
System.out.println(e.getMessage());
System.out.println(": Polaczenie zerwane.");
}
}
}
Java