Hola, estoy empezando a leer un libro de programación cliente-servidor y no puedo ejecutar el siguiente ejemplo:

import java.net.Socket;
import java.net.SocketException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class TCPEchoClient {

public static void main(String[] args) throws IOException {

if ((args.length < 2) || (args.length > 3)) // Test for correct # of args
{
throw new IllegalArgumentException("Parameter(s): <Server> <Word> [<Port>]");
}

String server = args[0]; // Server name or IP address
// Convert argument String to bytes using the default character encoding
byte[] data = args[1].getBytes();

int servPort = (args.length == 3) ? Integer.parseInt(args[2]) : 7;

// Create socket that is connected to server on specified port
Socket socket = new Socket(server, servPort);
System.out.println("Connected to server...sending echo string");

InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();

out.write(data); // Send the encoded string to the server

// Receive the same string back from the server
int totalBytesRcvd = 0; // Total bytes received so far
int bytesRcvd; // Bytes received in last read
while (totalBytesRcvd < data.length) {
if ((bytesRcvd = in.read(data, totalBytesRcvd,
data.length - totalBytesRcvd)) == -1) {
throw new SocketException("Connection closed prematurely");
}
totalBytesRcvd += bytesRcvd;
} // data array is full

System.out.println("Received: " + new String(data));

socket.close(); // Close the socket and its streams
}
}

He intentado hacerlo con el netbeans pasándole como argumentos una dirección IP + espacio + un puerto y no sé si se debe hacer de otro modo, si no pongo direcciones correctas, ... Me podríais ayudar?

Ya me ha funcionado, muchísimas gracias tenias razón, me faltaba el código del servidor para poder hacer que funcione (es que el del servidor sale un par de páginas más adelante y me pensaba que era independiente, soy muy torpe...) y el segundo parámetro es el mensaje. Dejaré aquí el programa del servidor por si a alguien le interesa en un futuro:

import java.net.*; // for Socket, ServerSocket, and InetAddress
import java.io.*; // for IOException and Input/OutputStream

public class TCPEchoServer {

private static final int BUFSIZE = 32; // Size of receive buffer

public static void main(String[] args) throws IOException {

if (args.length != 1) // Test for correct # of args
{
throw new IllegalArgumentException("Parameter(s): <Port>");
}

int servPort = Integer.parseInt(args[0]);

// Create a server socket to accept client connection requests
ServerSocket servSock = new ServerSocket(servPort);

int recvMsgSize; // Size of received message
byte[] receiveBuf = new byte[BUFSIZE]; // Receive buffer

while (true) { // Run forever, accepting and servicing connections
Socket clntSock = servSock.accept(); // Get client connection

SocketAddress clientAddress = clntSock.getRemoteSocketAddress();
System.out.println("Handling client at " + clientAddress);

InputStream in = clntSock.getInputStream();
OutputStream out = clntSock.getOutputStream();

// Receive until client closes connection, indicated by -1 return
while ((recvMsgSize = in.read(receiveBuf)) != -1) {
out.write(receiveBuf, 0, recvMsgSize);
}
clntSock.close(); // Close the socket. We are done with this client!
}
/* NOT REACHED */
}
}

No puedo editar el título del thread?