Question

I have a main application frame (MainFrame class). On actionperformed event of a JButton, a JPanel (MyJPanel class) is opened by placing it in JDialog. I am not extending JDialog to create MyJPanel class because I might need MyJPanel at other purposes too.

My Problem is I cannot programmatically close the MyJPanel which is displayed in JDialog. Is there anything that I missing? Could you please figure it out?

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;


    public class MainFrame extends JPanel {
        public MainFrame() {

            JButton btnOpenJdialog = new JButton("Open JDialog");
            add(btnOpenJdialog);
            btnOpenJdialog.addActionListener(new ActionListener() {

                public void actionPerformed(ActionEvent e) {
                    JDialog jd = new JDialog();
                    MyJPanel mjp = new MyJPanel(true);//showing in JDialog
                    jd.setTitle("JDialog");
                    jd.add(mjp);
                    jd.pack();
                    jd.setVisible(true);

                }
            });
        }

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

                public void run() {
                    createAndShowGUI();
                }
            });
        }

        public static void createAndShowGUI() {

            JFrame frame = new JFrame("Test-JFrame");
            frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
            frame.getContentPane().add(new MainFrame());
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        }

    }

MyJPanel Class :

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JPanel;
import javax.swing.JButton;

public class MyJPanel extends JPanel {
    private boolean isShownInJDialog = false;

    public MyJPanel() {
        JButton btnCloseMe = new JButton("Finish Action");
        add(btnCloseMe);
        btnCloseMe.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                if (isShownInJDialog) {
                    MyJPanel.this.setVisible(false);
                    //how to close the JDialog too.
                }
                else {
                    //just hide the content, 
                    MyJPanel.this.setVisible(false);
                }
            }
        });
    }

    public MyJPanel(boolean isShownInJDialog) {
        this();
        this.isShownInJDialog = isShownInJDialog;

    }

}

UPDATE
I was able to solve this using Howard’s answer as :

...     
if (isShownInJDialog) {
        Window w = SwingUtilities.getWindowAncestor(MyJPanel.this);
        w.setVisible(false);
}
...

Answer 1

If I understand your question correctly, you want to close the JDialog which your MyJPanel is contained in but do not have a reference to it?

You may either provide such a reference using the constructor of MyJPanel or change the code inside your ActionListener to

Window w = SwingUtilities.getWindowAncestor(MyJPanel.this);
w.setVisible(false);

which looks up the parent window of your panel without direct reference.