The following program uses the Daytime protocol to obtain the date and time from

port 13 of user-specified host(s). It provides a text field for input of the host name

by the user and a text area for output of the host’s response. There are also two

buttons, one that the user presses after entry of the host name and the other that

closes down the program. The text area is ‘wrapped’ in a JScrollPane, to cater for

long lines of output, while the buttons are laid out on a separate panel. The

application frame itself will handle the processing of button presses, and so

implements the ActionListener interface. The window-closing code (encapsulated in

an anonymous WindowAdapter object) ensures that any socket that has been opened

is closed before exit from the program.