Change the icon of the coffee cup appears in the JFrame, above left, is easy. Just call the setIconImage () in JFrame.
frame.setIconImage (new ImageIcon ("fichero.gif"). GetImage ());
The JDialog not have this method, but inherits the icon from its parent. For this, simply create wiping as the father on a JFrame constructor that has the icon changed, or another JDialog which in turn will have changed the icon
JDialog dialog = new JDialog (frame);
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