import java.io.*;
import java.net.*;

public class Client {

   static private int portnumber = 8080;

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

      InetAddress addrs = InetAddress.getByName(null);
      Socket socket;

      try {
         socket = new Socket (addrs, portnumber);
         BufferedReader in = new BufferedReader(
                              new InputStreamReader(socket.getInputStream()));
         PrintWriter out = new PrintWriter(
                            new BufferedWriter(
                             new OutputStreamWriter(socket.getOutputStream())), true);
         System.out.println(in.readLine());
         String str;
         while (!(str = Tool.leggiString("Inserire il messaggio da inviare (END per uscire): ")).equalsIgnoreCase("END")) {
            out.println("Gruppo 21 ha scritto: "+str);
            System.out.println(in.readLine());
         }
         out.println("END");
         System.out.println(in.readLine());
         socket.close();
      } catch (IOException e) {
         System.out.println("Server non attivo");
      }
   }
}


import java.text.*;
import java.util.*;

public class Tool {

   static private BufferedReader input = new BufferedReader (new InputStreamReader(System.in));
   static private Random rand = new Random();

   static public String leggiString (String messaggio) {
      String s = null;
      while (s == null) {
         try {
            System.out.print(messaggio);
            return input.readLine();
         } catch (IOException ioexc) {
            System.out.println("\t\t* * * Error! * * *\nProblema con il dispositivo d'ingresso");
         }
      }
      return s;
   }
}