How to Display a Countdown in a Separate Window Using a Timer without Buttons?

Calling One JFrame from Another Using Timer without Buttons

Q: How can I call one JFrame from another using a timer without using any buttons?

A: While the provided question lacks clarity, it's not advisable to use multiple frames for GUI design. Instead, consider using a modeless dialog as described below.

Solution Using a Modeless Dialog

This solution uses a modeless dialog with an enclosed JOptionPane to display a countdown. The JOptionPane listens for a PropertyChangeEvent using javax.swing.Timer.

Model Class (JOptionTimeTest)

<code class="java">import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.Timer;

/**
 * @see https://stackoverflow.com/a/12451673/230513
 */

public class JOptionTimeTest implements ActionListener, PropertyChangeListener {

    private static final int TIME_OUT = 10;
    private int count = TIME_OUT;
    private final Timer timer = new Timer(1000, this);
    private JDialog dialog = new JDialog();
    private final JOptionPane optPane = new JOptionPane();

    // Main method
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            public void run() {
                new JOptionTimeTest().createGUI();
            }
        });
    }

    // Create GUI and display countdown
    private void createGUI() {</code>

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