Swing: how do I launch a child window?

Question

How do I open a child window or frame, get the user input on this window, and return to the parent window? I know JOptionPane has some static methods that triggers message windows, but they're too simple to meet my needs.
What lines of code should I write in the parent window (JPanel/JFrame)? And what object should I create for the child window? Thank you!

Answer 1

JDialog d = new JDialog(f, "Enter something!", true);
// assuming f is a reference to the main JFrame
// fill with whatever GUI
d.pack();
d.show();
// will block til closed...
// read in filled data...
You can do more in JOptionPane then is suggests. If you want some complex GUI to enter different things, do the JDialog thing. If you just want one value, you can do something like this:
JPasswordField pwd = new JPasswordField();
Object[] objs = { "Enter password:", pwd };
if(JOptionPane.showConfirmDialog(this, objs, "Enter password",
          JOptionPane.OK_CANCEL_OPTION,
          JOptionPane.PLAIN_MESSAGE) == JOptionPane.CANCEL_OPTION) {
     return; // cancelled
} else {
   String pass = new String(pwd.getPassword());
   // use it...
}