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public class EchoClient{

 Socket sock;
 public final int ECHO_PORT=7;
 InputStream in;
 OutputStream out;
 String line;

   public EchoClient(String host){

 try{
     sock=new Socket(host,ECHO_PORT);
     in=sock.getInputStream();
     out=sock.getOutputStream();
    }
 catch(IOException ex){
  System.out.println("Error while connecting to host");
  System.out.println("Maybe you should try another host.");
  System.exit(0);
   }
 line="";
 }

   public void send_get(){

 int len=line.length();
 try{
     if(!(line.equals(""))){
  for(int i=0;i<len;i++)
   out.write((int)line.charAt(i));
  out.write((int)'\n');

  line="";
  while((len=in.read())!=(char)'\n')
   line+=String.valueOf((char)len);
  System.out.print("Response from server: ");
  System.out.println(line);
   }
     }
 catch(IOException e){e.printStackTrace();}
 }

   public void execute()throws IOException{

 DataInputStream dain=new DataInputStream(System.in);
 System.out.print("Enter first word, exit to end >");
 System.out.flush();
 line=dain.readLine();

 while(!(line.equals("exit"))){
  send_get();
  System.out.print("Enter next word >");
  System.out.flush();
  line=dain.readLine();
    }

 in.close();
 out.close();
 sock.close();
 }

   public static void main(String args[]){

 if(args.length!=1){
  System.out.println("This program takes the hostname");
  System.out.println("as the only argument.");
  System.exit(0);}

 String host=args[0];
 EchoClient ec=new EchoClient(host);
 try{
    ec.execute();
    }
 catch(IOException e){e.printStackTrace();}
 }
}