Java How to Program, Early Objects, 11th Edition

... DatagramPacket(data,
45                         data.length, InetAddress.getLocalHost(), 5000);
46
47                      socket.send(sendPacket); // send packet
48                      displayArea.append("Packet sent\n");
49                      displayArea.setCaretPosition(
50                         displayArea.getText().length());
51                    }
52                    catch (IOException ioException)
53                    {
54                       displayMessage(ioException + "\n");
55                       ioException.printStackTrace();
56                    }
57                }
58            }
59       );
60
61       add(enterField, BorderLayout.NORTH);
62
63       displayArea = new JTextArea();
64       add(new JScrollPane(displayArea), BorderLayout.CENTER);
65
66       setSize(400, 300); // set window size
67       setVisible(true); // show window
68
69       try // create DatagramSocket for sending and receiving packets
70       {
71          socket = new DatagramSocket();
72       }
73       catch (SocketException socketException)
74       {
75 socketException.printStackTrace(); ...