Exemple de code pour superposer plusieurs icônes.

import java.awt.Component;
import java.awt.Graphics;
import java.awt.Image;

import java.awt.image.ImageObserver;
 
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
 
/**
 * ImageIcon working with two icons than can be superposed for
 * drawing various elements : errors, warning ...
 * @author A.Brillant */
public class ImageIconProxy extends ImageIcon {

	private ImageIcon rootIcon;
	private ImageIcon overridingIcon;
	private int xicon, yicon;
	
	/** Main icon */
	public ImageIconProxy( ImageIcon rootIcon ) {
		this.rootIcon = rootIcon;
	}
 
	/** Main icon and a secondary one more little that will b
e drawn on the main one
	 * @param rootIcon the main icon
	 * @param x the location of the second one
	 * @param y the location of the second one
	 * @param overridingIcon the second one
	 */
	public ImageIconProxy( ImageIcon rootIcon, i
nt x, int y, ImageIcon overridingIcon ) {

		this( rootIcon );
		setOverridingIcon( x, y, overridingIcon );
	}
 
	public void setOverridingIcon( int x, int y,
 ImageIcon overridingIcon ) {
		this.xicon = x;
		this.yicon = y;
      this.overridingIcon = overridingIcon;
	}
 
	public int getIconHeight() {
		return rootIcon.getIconHeight();
	}

 
	public int getIconWidth() {
		return rootIcon.getIconWidth();
	}
 
	public Image getImage() {

		return rootIcon.getImage();
	}
 
	public int getImageLoadStatus() {
		return rootIcon.getImageLoadStatus();
	}

 
	public ImageObserver getImageObserver() {
		return rootIcon.getImageObserver();
	}
 
	public boolean activeOverringImage = false;

 
	public synchronized void paintIcon(Component arg0, G
raphics arg1, int x, int y) {

		arg1.drawImage( rootIcon.getImage(), x, y, null );
		if ( activeOverringImage && overridingIcon != null ) {
			arg1.drawImage( overridingIcon.getImage(), x 
+ xicon, y + yicon, null );
		}

	}
	
	public void setImage(Image arg0) {
		rootIcon.setImage(arg0);
	}
 
	public void setImageObserver(ImageObserver arg0) {

		rootIcon.setImageObserver(arg0);
	}
 
	public static void main( String[] args ) {
		JFrame fr = new JFrame();
		fr.setSize( 300, 300 );
		ImageIcon ii = new ImageIcon( "OkCancelDialog.gif" );
		ImageIcon ii2 = new ImageIcon( "little_bug_red.png" );
		ImageIconProxy iip = new ImageIconProxy( ii );
		iip.setOverridingIcon( 10, 10, ii2 );
		iip.activeOverringImage = true;
		fr.add( new JButton( iip ) );
		fr.setVisible( true );
	}
}