[Ch15] 2nd Ed Simple Chat Client

package ch15;

import javax.swing.*;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.IOException;

import java.io.PrintWriter;

import java.net.Socket;

public class SimpleChatClientA {

  JTextField outgoing;

  PrintWriter writer;

  Socket sock;

  public void go() {

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

    JPanel mainPanel = new JPanel();

    outgoing = new JTextField(20);

    JButton sendButton = new JButton("Send");

    sendButton.addActionListener(new SendButtonListener());

    mainPanel.add(outgoing);

    mainPanel.add(sendButton);

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

    setUpNetworking();

    frame.setSize(400, 500);

    frame.setVisible(true);

  } // close go

  private void setUpNetworking() {

    try {

      sock = new Socket("127.0.0.1", 5000);

      writer = new PrintWriter(sock.getOutputStream());

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

    } catch (IOException ex) {

      ex.printStackTrace();

    }

  } // close setUpNetworking

  public class SendButtonListener implements ActionListener {

    public void actionPerformed(ActionEvent ev) {

      try {

        writer.println(outgoing.getText());

        writer.flush();

      } catch (Exception ex) {

        ex.printStackTrace();

      }

      outgoing.setText("");

      outgoing.requestFocus();

    }

  } // close SendButtonListener inner class

  public static void main(String[] args) {

    new SimpleChatClientA().go();

  }

} // close outer class

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