Core JFC Java Foundation Classes 2nd edition - Read

992 Chapter 8 Creating Custom Dialogs
cally abort the operation that is being monitored for any reason, you must call
the progress monitor's close method to allow it to dismiss the dialog.
It is possible to demonstrate ProgressMonitor by making some changes
to the actionPerf ormed method of the previous example. Instead of having
ProgressMonitorlnputStream create and manage the Progress-
Monitor behind the scenes, the new version will create its own and have it
display not only the current progress but also how long it thinks the operation
will take to complete. To do this, the setNote method will be used to write a
text string with the current time remaining onto the dialog box. Listing 8-17
shows the new actionPerf ormed method.
Core Note
If you press the Cancel button on the dialog shown by
ProgressMonitorlnputStream, the I/O operation is terminated with
an exception because the ProgressMonitorlnputStream is handling
the 110. If you use a ProgressMonitor, dismissing it has no effect on
the I/O, because it isn't directly involved in it.
Listing 8-17 Displaying extra information with a
ProgressMonitor
public void actionPerformed(ActionEvent evt) {
wordsFound.setText("");
fileName.setEnabled(false);
final String name = fileName.getText().trim();
final File f = new File(name);
final float size = (float)new File(name).length{)
II Total size of file
monitor = new ProgressMonitor(this,
"Counting words in " + name,
TIME_STRING,
0, (int)size) ;
Thread t = new Thread() {
public void run() {
BufferedReader r = null;
try {
words = 0;