[Ch15] Updating SimpleChatClient to align with SimpleChatClientA as it went into the book.

import javax.swing.*;

import java.awt.BorderLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.PrintWriter;

import java.awt.event.*;

import java.io.*;

import java.net.InetSocketAddress;

import java.nio.channels.Channels;

import java.nio.channels.SocketChannel;

import java.nio.channels.*;

import java.nio.charset.StandardCharsets;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

  private PrintWriter writer;

  public void go() {

    setUpNetworking();

    incoming = new JTextArea(15, 30);

    incoming.setLineWrap(true);

    incoming.setWrapStyleWord(true);

    mainPanel.add(outgoing);

    mainPanel.add(sendButton);

    setUpNetworking();

    ExecutorService executor = Executors.newSingleThreadExecutor();

    executor.execute(new IncomingReader());

  }

  private void setUpNetworking() {

    try {

      SocketChannel socketChannel = SocketChannel.open(new InetSocketAddress("127.0.0.1", 5000));

    InetSocketAddress serverAddress = new InetSocketAddress("127.0.0.1", 5000);

    try (SocketChannel socketChannel = SocketChannel.open(serverAddress)) {

      reader = new BufferedReader(Channels.newReader(socketChannel, StandardCharsets.UTF_8));

      writer = new PrintWriter(Channels.newWriter(socketChannel, StandardCharsets.UTF_8));