Client/server with sockets - JavaTech: An Introduction to Scientific and Technical Computing with Java - page 460

Figure 15.3 The client interface allows the user to initiate a connection with the
server at the host address given in a text field. A user name is given to the server in a
log in procedure. The data obtained from the server is displayed in two histograms.
The top one shows the values in each data channel for a reading of a set of data. The
lower histograms displays the distribution of values over a number of data set
readings for a channel selected by the user via the text field labeled “Channel”.
... Skip GUI setup in the DataClient . . .
public void actionPerformed (ActionEvent e) {
Object source = e.getSource ();
if (source == fStartButton) {
if (fStartButton.getText ().equals ( " Start " ))
start ();
else
stop ();
}