<code java>
package instantMessanger;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.net.UnknownHostException;

public class Messanger {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		final int PORTA = 17191;
		final int DELAY = 5000;
		final int VARIA = 1000;

		ServerSocket ss = null; 
		try {
			ss = new ServerSocket(PORTA);
		} catch (IOException e) {
			System.out.println("Errore nella creazione del serverSocket");
			return;
		}
		int timeout = DELAY + ((int) Math.random()*VARIA);
		try {
			ss.setSoTimeout(timeout);
		} catch (SocketException e) {
			System.out.println("Non riesco a mettere un timeout sul socket");
			System.out.println(e.getCause());
		}
		Socket s = null;
		while(true) {
			try {
				s = ss.accept();
				System.out.println("Sono il server");
				break;		// se ci riesco esco dal ciclo 
			} catch (SocketTimeoutException e) {
				System.out.println("timeout scattato");
				try {
					Thread.sleep(1000);
				} catch (InterruptedException e1) {
					e1.printStackTrace();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			try {
				s = new Socket(args[0],PORTA);
				System.out.println("Sono il client");
				break;		// se ci riesco esco dal ciclo 
			} catch (UnknownHostException e) {
				System.out.println("Nome dell'host errato: "+args[0]);
				return;
			} catch (IOException e) {
				System.out.println("host remoto non risponde");
			}
		}
		System.out.println("Connessione stabilita");
		CopyThread leggi = null; 
		CopyThread scrivi = null; 
		try {
			leggi = 
				new CopyThread(s.getInputStream(),System.out,"da remoto");
			scrivi = 
				new CopyThread(System.in,s.getOutputStream(),"per remoto");
			leggi.start();
			scrivi.start();
		} catch (IOException e) {
			e.printStackTrace();
		}

		try {
			leggi.join();
			System.out.println("Thread socket -> video terminato");
			scrivi.join();
			System.out.println("Thread tastiera -> socket terminato");
		} catch (InterruptedException e) {
			e.printStackTrace();
		}

	}

}
</code>