Flip a coin endlessly v2 - StopSender

package com.rmb.randomnodatabase.taskmanagement;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

/**
 * Send stop signal to {@link StopListener} via port
 * {@link StopListener#DEFAULT_PORT}.
 *
 * See: http://bit.ly/1oKSnHu
 *
 * @author RobertMarkBram
 */
public final class StopSender {

   /** Host to use. */
   public static final String HOST = "localhost";

   /** Create StopSender. */
   public StopSender() {
   }

   /**
    * Open socket and send default stop signal.
    */
   public void sendStopSignal() {
      sendStopSignal(StopListener.STOP_SIGNAL);
   }

   /**
    * Open socket and send stop signal.
    *
    * @param message
    *           whatever string you want to send to {@link StopListener}, may be
    *           used for communicating error messages.
    */
   public void sendStopSignal(final String message) {
      try (Socket socket = new Socket(HOST, StopListener.DEFAULT_PORT);
            PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
            BufferedReader in =
                  new BufferedReader(new InputStreamReader(
                        socket.getInputStream()));) {
         out.println(message);
         final String received = in.readLine();
         System.out.println(received);
      } catch (UnknownHostException e) {
         System.err.println("Don't know about host [" + HOST + "].");
         System.exit(1);
      } catch (IOException e) {
         System.err.println("Couldn't get I/O for the connection to [" + HOST
               + "].");
         System.exit(1);
      }
   }

   /**
    * @param args
    *           - 0: stop message. May be null.
    */
   public static void main(final String[] args) {
      StopSender sender = new StopSender();
      if (args.length > 0) {
         sender.sendStopSignal(args[0]);
      } else {
         sender.sendStopSignal();
      }
   }

}