Re: exception
Lew wrote:
RedGrittyBrick wrote:
Maybe its simpler to show how I think it should be done.
[snip]
All that I/O - could end up being a lengthy process, ergo, a candidate
to move off the EDT.
Ooh yes ... let me dig myself a little deeper ...
Art, please avert your gaze ...
public void actionPerformed(ActionEvent e) {
// Blindly copying usenet may be hazardous to your education.
frame.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
final String name = StudentTextField.getText();
new SwingWorker<Void, Void>() {
private IOException pendingException;
@Override
protected Void doInBackground() { // not EDT
try {
FileWriter swriter = new FileWriter(
"c:\\studname.txt",true);
PrintWriter outputFile= new PrintWriter(swriter);
outputFile.println(name);
outputFile.close();
FileWriter gwriter = new FileWriter(
"c:\\grades.txt",true);
PrintWriter outputFile2 = new PrintWriter(gwriter);
outputFile2.println("0,0,0");
outputFile2.close();
} catch (IOException x) {
pendingException = x;
System.out.println("Unable to add student - "
+ pendingException.getMessage());
}
}
@Override
protected void done() { // on EDT
frame.setCursor(null);
if (pendingException == null) {
StudentTextField.setText("");
} else {
JOptionPane.showMessageDialog(
frame,
"Unable to add student - "
+ pendingException.getMessage,
"AppName",
JOptionPane.ERROR_MESSAGE);
System.exit(1); // or let 'em retry?
}
}
}.execute();
}
Untested, undoubtedly borken in many ways, ++caveat emptor--;
(Also IMO needs refactoring into smaller methods/classes to tame
indentation a bit)