Creating a Frame that stays in the background (Swing only)

SturdyWindow.java

import java.awt.Color;
import java.awt.Dimension;

import javax.swing.JPanel;
import javax.swing.JWindow;

public class SturdyWindow
{
  public static void main( final String[] args )
  {
    final JWindow demoWindow = new JWindow();

    final JPanel bigRedPanel = new JPanel();
    final Dimension size = new Dimension( 800, 600 );
    bigRedPanel.setMinimumSize( size );
    bigRedPanel.setPreferredSize( size );
    bigRedPanel.setBackground( Color.RED );
    demoWindow.add( bigRedPanel );

    demoWindow.pack();
    demoWindow.setVisible( true );

    demoWindow.toBack();
  }
}

TODO:

• Make moveable and resizable
• Try the same with JavaFX