Calling a frame to return a value

Question

I have a frame with a JButton. When pressed, a calendar frame I had created will be displayed. A user will select the date from the calendar frame and the value will be returned to the frame where the JButton was pressed.
The following is a section of the code from the Calendar frame I created.
public String getDate(){
    this.setVisible(true);
    return date;  /* A variable declared on creation to hold the date value when selected*/
}Code from the frame calling the Calendar frame.
private void jButtonDate_actionPerformed(ActionEvent e) {
     CalendarFrame cal = new CalendarFrame();   
     String date = cal.getDate();
     System.out.println(date);  /* Used as a test to see if the call is performed correctly.*/
}When the date Button is pressed, the calendar frame is displayed and null is printed to the output window.
My problem is that I don't want the program to do anything until a date has been selected.
Does anyone have any idea as to what I am doing wrong? Any ideas would be helpful.
Jason Franz.

Answer 1

So, this is what I have in my code.
I have the CalendarFrame extending JDialog.
public class CalendarFrame extends JDialog {Now I'm not to sure on what you mean about the "parentFrame".
super(parentFrame, "Pick a Date", true);This is what my constructor looks like.
  public CalendarFrame() {
    super();
    try  {
      jbInit();
    catch (Exception e) {
      e.printStackTrace();
  }Jason