since: 1.5 -

 public BasicDesktopIconUI() 
{

}

 protected MouseInputListener createMouseInputListener() 
{
        return new MouseInputHandler();
}

 public static ComponentUI createUI(JComponent c) 
{
        return new BasicDesktopIconUI();
}

 public  void deiconize() 
{
        try { frame.setIcon(false); } catch (PropertyVetoException e2) { }
}

 public Insets getInsets(JComponent c) 
{
        JInternalFrame iframe = desktopIcon.getInternalFrame();
        Border border = iframe.getBorder();
        if(border != null)
            return border.getBorderInsets(iframe);
        return new Insets(0,0,0,0);
}

 public Dimension getMaximumSize(JComponent c) 
{
        return iconPane.getMaximumSize();
}

Desktop icons can not be resized. Therefore, we should always return the minimum size of the desktop icon.

 public Dimension getMinimumSize(JComponent c) 
{
        Dimension dim = new Dimension(iconPane.getMinimumSize());
        Border border = frame.getBorder();
        if (border != null) {
            dim.height += border.getBorderInsets(frame).bottom +
                          border.getBorderInsets(frame).top;
        }
        return dim;
}

 public Dimension getPreferredSize(JComponent c) 
{
        return desktopIcon.getLayout().preferredLayoutSize(desktopIcon);
}

 protected  void installComponents() 
{
        iconPane = new BasicInternalFrameTitlePane(frame);
        desktopIcon.setLayout(new BorderLayout());
        desktopIcon.add(iconPane, BorderLayout.CENTER);
}

 protected  void installDefaults() 
{
        LookAndFeel.installBorder(desktopIcon, "DesktopIcon.border");
        LookAndFeel.installProperty(desktopIcon, "opaque", Boolean.TRUE);
}

 protected  void installListeners() 
{
        mouseInputListener = createMouseInputListener();
        desktopIcon.addMouseMotionListener(mouseInputListener);
        desktopIcon.addMouseListener(mouseInputListener);
}

 public  void installUI(JComponent c) 
{
        desktopIcon = (JInternalFrame.JDesktopIcon)c;
        frame = desktopIcon.getInternalFrame();
        installDefaults();
        installComponents();
        // Update icon layout if frame is already iconified
        JInternalFrame f = desktopIcon.getInternalFrame();
        if (f.isIcon() && f.getParent() == null) {
            JDesktopPane desktop = desktopIcon.getDesktopPane();
            if (desktop != null) {
                DesktopManager desktopManager = desktop.getDesktopManager();
                if (desktopManager instanceof DefaultDesktopManager) {
                    desktopManager.iconifyFrame(f);
                }
            }
        }
        installListeners();
        JLayeredPane.putLayer(desktopIcon, JLayeredPane.getLayer(frame));
}

 protected  void uninstallComponents() 
{
        desktopIcon.remove(iconPane);
        desktopIcon.setLayout(null);
        iconPane = null;
}

 protected  void uninstallDefaults() 
{
        LookAndFeel.uninstallBorder(desktopIcon);
}

 protected  void uninstallListeners() 
{
        desktopIcon.removeMouseMotionListener(mouseInputListener);
        desktopIcon.removeMouseListener(mouseInputListener);
        mouseInputListener = null;
}

 public  void uninstallUI(JComponent c) 
{
        uninstallDefaults();
        uninstallComponents();
        // Force future UI to relayout icon
        JInternalFrame f = desktopIcon.getInternalFrame();
        if (f.isIcon()) {
            JDesktopPane desktop = desktopIcon.getDesktopPane();
            if (desktop != null) {
                DesktopManager desktopManager = desktop.getDesktopManager();
                if (desktopManager instanceof DefaultDesktopManager) {
                    // This will cause DefaultDesktopManager to layout the icon
                    f.putClientProperty("wasIconOnce", null);
                    // Move aside to allow fresh layout of all icons
                    desktopIcon.setLocation(Integer.MIN_VALUE, 0);
                }
            }
        }
        uninstallListeners();
        frame = null;
        desktopIcon = null;
}