Java Socket create client via PrintWriter

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

public class Main {

   public static Socket socket = null;
   public static PrintWriter out;
   public static BufferedReader in;

   public static void main(String[] args) {
      String host = "127.0.0.1";
      int port = 1234;

      try {/*w  ww .  j  av a  2s  . com*/
         // Create socket connection
         socket = new Socket(host, port);
         // Obtain a handle on the socket output
         out = new PrintWriter(socket.getOutputStream(), true);
         // Obtain a handle on the socket input
         in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
         testConnection();
         System.out.println("Closing the connection...");
         out.close();
         in.close();
         socket.close();
         System.exit(1);
      } catch (UnknownHostException e) {
         System.out.println(e);
         System.exit(1);
      } catch (IOException e) {
         System.out.println(e);
         System.exit(1);
      }
   }

   public static void testConnection() {
      String serverResponse = null;
      if (socket != null && in != null && out != null) {
         System.out.println("Successfully connected, now testing...");

         try {
            // Send data to server
            out.println("Here is a test.");
            // Receive data from server
            while ((serverResponse = in.readLine()) != null)
               System.out.println(serverResponse);
         } catch (IOException e) {
            System.out.println(e);
            System.exit(1);
         }
      }
   }
}