[Ch15] Using single thread executor instead of starting the Thread itself.

import java.nio.channels.Channels;

import java.nio.channels.SocketChannel;

import java.nio.charset.StandardCharsets;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

public class SimpleChatClient {

  private JTextArea incoming;

    setUpNetworking();

    Thread readerThread = new Thread(new IncomingReader());

    readerThread.start();

    ExecutorService executor = Executors.newSingleThreadExecutor();

    executor.execute(new IncomingReader());

    JFrame frame = new JFrame("Ludicrously Simple Chat Client");

    frame.getContentPane().add(BorderLayout.CENTER, mainPanel);

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

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

      System.out.println("networking established");

      System.out.println("Networking established. Client running at: " + socketChannel.getLocalAddress());

    } catch (IOException ex) {

      ex.printStackTrace();

    }