public int getFreeGensDialog() {
String numGensStr =
JOptionPane.showInputDialog(
uacalc, "Number of generators?", "Free Algebra", JOptionPane.QUESTION_MESSAGE);
if (numGensStr == null) return -1;
int gens = -1;
boolean gensOk = true;
try {
gens = Integer.parseInt(numGensStr);
} catch (NumberFormatException e) {
gensOk = false;
}
if (!gensOk || gens <= 0) {
JOptionPane.showMessageDialog(
this,
"<html>The number of generators must be positive.<br>" + "Try again.</html>",
"Number format error",
JOptionPane.ERROR_MESSAGE);
return -1;
}
return gens;
}
