Save (serialize) current list to a file. Java 1.1's
Object Persistence does all the work; we just ask it
to save the entire User List (a Vector), and an Integer
which represents the currently-selected user, if any.
if (usrList.size() == 0) {
JOptionPane.showMessageDialog(this,
"Nothing to save",
"No records to save! Save ignored",
JOptionPane.WARNING_MESSAGE);
return;
}
try {
File f = new File(FILENAME);
if (f.exists()) {
String fn = FILENAME, bfn = BACKFILENAME;
File bk = new File(bfn);
if (bk.exists()) {
// println("Deleting " + bk.getName());
if (!bk.delete())
throw new IOException("Delete of " + bk.getName() + " failed!");
}
if (!f.renameTo(bk))
throw new IOException("Rename of " + f.getName() + " to " + bk.getName() + " failed!");
}
ObjectOutputStream s = new ObjectOutputStream(
new FileOutputStream(FILENAME));
s.writeObject(usrList);
s.writeObject(new Integer(visList.getSelectedIndex()));
s.flush();
s.close();
} catch (Exception e) {
JOptionPane.showMessageDialog(this,
"I/O Error", "I/O Error Saving: " + e,
JOptionPane.ERROR_MESSAGE);
}
