How can I use a timer to display a modaless JDialog from another JFrame without using buttons?

Calling One JFrame from Another Using Timer Without Buttons

Instead of using buttons to trigger the display of a nested JFrame, consider employing a modeless dialog. This technique offers a cleaner and more efficient approach.

Implementation:

1. Modeless Dialog:

• Create a modeless JDialog, which is a top-level container that allows interaction with the underlying frame.

2. Timer for Countdown:

• Utilize a javax.swing.Timer to initiate a countdown that will automatically open the JDialog at a specific time interval.

3. PropertyChangeListener:

• Register a PropertyChangeListener for the JDialog to monitor changes in its value property.

4. Display Dialog:

• When a property change event is fired, hide the JDialog and dispatch a WINDOW_CLOSING event to close it.

Use Case:

The following code snippet demonstrates this technique:

<code class="java">import javax.swing.*;

public class TimedDialogExample {

    // Countdown time in seconds
    private static final int TIME_OUT = 10;

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            // Create a frame
            JFrame frame = new JFrame("Main Frame");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setSize(400, 300);

            // Create a dialog
            JDialog dialog = new JDialog(frame);
            dialog.setSize(300, 200);

            // Create a timer to display the dialog after TIME_OUT seconds
            Timer timer = new Timer(1000, e -> {
                // Hide the dialog
                dialog.setVisible(false);
                // Dispatch a WINDOW_CLOSING event to close the dialog
                dialog.dispatchEvent(new WindowEvent(dialog, WindowEvent.WINDOW_CLOSING));
            });
            timer.start();

            // Set the dialog's content
            JPanel panel = new JPanel();
            panel.add(new JLabel("This is the dialog"));
            dialog.add(panel);

            // Make the frame visible
            frame.setVisible(true);

            // Display the dialog after TIME_OUT seconds
            timer.stop();
            dialog.setVisible(true);
        });
    }
}</code>

By employing this technique, you can automatically open a nested JDialog without the need for additional buttons. This approach provides a streamlined and intuitive user experience, especially when the timing of the display is crucial.

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