public void actionPerformed(ActionEvent e) {
String name = null;
name =
JOptionPane.showInputDialog(
objUpdate.this,
"Enter a name (eg. John Russell)",
"Input Person",
JOptionPane.QUESTION_MESSAGE);
if (!(name == null)) {
// prompt the user for a date
String date = null;
date =
JOptionPane.showInputDialog(
objUpdate.this,
"Enter Date (eg. 06/17/1946)",
"Input Person",
JOptionPane.QUESTION_MESSAGE);
if (!(date == null)) {
// convert String to Date
try {
Date d = f.parse(date);
p = new Person(name, d);
persons.add(p);
index = persons.lastIndexOf(p);
displayRecord();
} catch (ParseException ex) {
JOptionPane.showMessageDialog(
objUpdate.this, "Invalid date format!", "Input Error", JOptionPane.ERROR_MESSAGE);
}
}
}
}
public PowerSupply() {
super();
String str = JOptionPane.showInputDialog("Enter frequency");
this.frequency = Double.parseDouble(str);
this.impedance = new Complex(0.0, 0.0);
}