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From: Jeff Higgins <jeff@invalid.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: paintComponent(Graphics graphics)
Date: Fri, 20 Feb 2015 19:55:44 -0500
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On 02/20/2015 07:42 PM, Knute Johnson wrote:

>> I'm assuming you have a translucent image you want to draw over the
>> whole JPanel.  Draw on the JFrame's glasspane.  I think you will have to
>> make the glasspane visible.
>>
>>
>
> http://docs.oracle.com/javase/tutorial/uiswing/components/rootpane.html
>

Thank you. Your response prompted me to have another look.
<http://docs.oracle.com/javase/tutorial/uiswing/misc/jlayer.html#drawing>

So that from the example:

class WallpaperLayerUI extends LayerUI<JComponent> {
   @Override
   public void paint(Graphics g, JComponent c) {
     super.paint(g, c);

     Graphics2D g2 = (Graphics2D) g.create();

     int w = c.getWidth();
     int h = c.getHeight();
     g2.setComposite(AlphaComposite.getInstance(
             AlphaComposite.SRC_OVER, .5f));
     g2.setPaint(new GradientPaint(0, 0, Color.yellow, 0, h, Color.red));
     g2.fillRect(0, 0, w, h);

     g2.dispose();
   }
}

Which answers my question to the OP regards
create and dispose of graphics object.