package com.example;

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 EchoClient {
  public static void main(String[] args) throws IOException {
    if (args.length != 2) {
      System.err.println("Usage: java EchoClient <host name> <port number>");
      System.exit(1);
    }
    String hostName = args[0];
    int portNumber = Integer.parseInt(args[1]);
    try (Socket echoSocket = new Socket(hostName, portNumber);
      PrintWriter out = new PrintWriter(echoSocket.getOutputStream(), true);
      BufferedReader in = new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));
      BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in))) {
      String userInput;
      while ((userInput = stdIn.readLine()) != null) {
        out.println(userInput);
	System.out.println("echo: " + in.readLine());
      }
    }catch (UnknownHostException e) {
       System.err.println("Don't know about host " + hostName);
       System.exit(1);
    }catch (IOException e) {
       System.err.println("Couldn't get I/O for the connection to " + hostName);
       System.exit(1);
    } 
  }
}