Interacting with Networks and Databases - Beginning Java 7 - page 807

final JButton btnConnect = new JButton("Connect");
ActionListener al;
al = new ActionListener()
{

@Override
public void actionPerformed(ActionEvent ae)
{

txtUsername.setFocusable(false);
String username = txtUser-

name.getText().trim();
try
{

socket = new Socket(SERVER_ADDR,

SERVER_PORT);

btnConnect.setEnabled(false);
InputStreamReader isr;
isr = new InputStreamRead-

er(socket.getInputStream());
br = new BufferedReader(isr);
pw = new

PrintWriter(socket.getOutputStream(), true);
txtOutput.append(br.readLine()+"\n");
pw.println((!username.equals(""))?username:"unknown");
txtInput.setEnabled(true);
btnSend.setEnabled(true);
new Thread(new Runnable()
{

@Override
public void run()
{

String line;
try
{

while ((line =

br.readLine()) != null)

{