Passing a variable from one class to another

Question

Hello:
I am new to java programming. I am developing an application in Java
At a particular JTextField call it jtf3, I am invoking Calendar application by clikcing a jbutton.
I would like to set text in jtf by obtaining the date clicked by the user. I am storing complete date string in the Calendar application during ActionPerformed event at Calendar Application level.
I do not know how to pass this string to calling frame as it does not listen to the button event happening at the Calendar Application.
Much appreciated
Thanks a lot for your time
regards

Answer 1

This is the application from which the I am calling the calendar application.
The method setDate set the date obtained from calendar class during actionperformed event.
The actionperfomed event from CalendarClass is pasted below as well.
Much appreciated
import javax.swing.JFrame;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;
import java.awt.*;
public class TestDrive
public static void main(String[] args) {
DatePanelFrame dpf = new DatePanelFrame();
dpf.addWindowListener(new WindowAdapter( ) {
public void windowClosing(WindowEvent we) { System.exit(0); }
dpf.pack();
dpf.setVisible(true);
class DatePanelFrame extends JFrame {
JTextField djtf;
String dateInput;
public DatePanelFrame() {
setTitle("Date Panel");
setSize(100, 800);
setLocation(300, 100);
Container content = getContentPane();
JPanel datePanel = new JPanel();
JButton calButton = new JButton(".....");
datePanel.add(calButton, BorderLayout.SOUTH);
djtf = new JTextField(" ");
datePanel.add(djtf, BorderLayout.NORTH);
content.setLayout(new BorderLayout());
content.add(datePanel, BorderLayout.CENTER);
calButton.addActionListener(new ActionListener()
          public void actionPerformed(ActionEvent event)
JFrame fr = new CalendarClass();
fr.setSize(400, 400);
fr.setLocation(600, 100);
ObjCal oc = new ObjCal();
fr.setVisible(true);
public void setDate(String d)
djtf.setText(d);
repaint();
System.out.println(djtf.getText());
The ActionPerformed event from CalendarClass
jbtArray.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent event)
if (event.getActionCommand() != " ")
          daySelected = event.getActionCommand();
          yearSelected = jtfYear.getText();
          int intYearSelected = Integer.valueOf(yearSelected).intValue();
          monthSelected = jtfMonth.getText();
          intDaySelected = Integer.valueOf(daySelected).intValue();
          int intMonthSelected = getMonthNum(monthSelected);
          dateSelected = getDate(intYearSelected, intMonthSelected, intDaySelected);
          TestDrive td = new TestDrive();
          DatePanelFrame dpf = new DatePanelFrame();
          dpf.setDate(dateSelected);