Minimize a resizable JDialog

Question

I'm working on an swing application with a main window (which extends JFrame) from which several child windows can be opened (more than 1 contemporarily).
These windows are all non-modal and resizable.
So far, I implemented these 'child' windows as a JFrame. However, I get a new icon on my Windows taskbar for each opened Window.
I therefore tried to implement these windows as a JDialog with type ModalityType.MODELESS.
Looks OK except that a JDialog has no minimize button.

Is there a way to resolve this?
I.e., I need to create non-modal and resizable child windows that can be minimized.
JInternalFrame is not an option since the main frame is not just a container with a JDesktopPane and child windows should be able to cross the borders of the main window.

For those interested:
Child windows register and unregister themselves on the main window when being opened/closed.
The main window has a menu with a 'Windows' item and child windows are added/removed from that menu upon registration/unregistration.
The user can switch between the various windows by selecting an item within this menu.

Answer 1

I am offering two suggestions.

• A. Don't use the close button to get rid of the contents.
• B. Set the type of child jframes to be utility.

I think having the JDialog close button destroy data is setting your users up for data loss. I would instead use the close to just hide the window, and then have controls inside of the dialog to cancel/finish/restart.

import java.awt.*;

public class DiFrame{
    static JDialog log;
    static JFrame ame;
    public static void main(String[] args){
        JFrame frame = new JFrame("Father of two");
        
        JButton one  = new JButton("dialog");
        
        one.addActionListener( evt->{
            if(log==null){
                log = new JDialog(frame, "dialog child", false);
                log.add(new JTextArea("fresh start"));
                log.pack();
                log.setVisible(true);
            } else{
                log.setVisible(true);
            }
        });
        
        JButton two = new JButton("frame");
        
        two.addActionListener( evt->{
            if(ame==null){
                ame = new JFrame("frame child");
                ame.add( new JTextArea("fresh start") );
                ame.setType(Window.Type.UTILITY);
                ame.pack();
                ame.setVisible(true);
            } else{
                ame.setVisible(true);
            }
        });
        frame.add(one, BorderLayout.NORTH);
        frame.add(two, BorderLayout.SOUTH);

        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

  
}

Click the dialog button and it shows the dialog. Then the text area can be modified. When the dialog is closed it can be re-opened.

Click the frame button and a jframe is shown. ( I actually cannot check if this shows up as a new application because it doesn't on my computer anyways. )