import org.openide.awt.StatusLineElementProvider; //导入依赖的package包/类
static JPanel getStatusLineElements(JPanel panel) {
    if (result == null) {
        result = Lookup.getDefault().lookup(
                new Lookup.Template<StatusLineElementProvider>(StatusLineElementProvider.class));
        result.addLookupListener(new StatusLineElementsListener(panel));
    }

    Collection<? extends StatusLineElementProvider> c = result.allInstances();
    if (c == null || c.isEmpty()) {
        return null;
    }

    JPanel icons = new JPanel(new FlowLayout(FlowLayout.RIGHT, 0, 0));
    icons.setBorder(BorderFactory.createEmptyBorder(1, 0, 0, 2));
    //icons.setBorder(BorderFactory.createLineBorder(Color.RED));
    icons.setOpaque(false);

    boolean some = false;
    Iterator<? extends StatusLineElementProvider> it = c.iterator();
    while (it.hasNext()) {
        StatusLineElementProvider o = it.next();
        Component comp = o.getStatusLineElement();
        if(comp != null) {
            some = true;
            if(comp instanceof JComponent) {
                ((JComponent) comp).setOpaque(false);
            }

            setForeground(comp);
            icons.add(comp);
        }
    }
    
    return some ? icons : null;
}