java用画图做IconDemo，主要代码： @Override public void paintIcon(Component c, Graphics g, int x, int y) { Graphics2D g2d = (Graphics2D) g; g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON); BasicStroke stroke = new BasicStroke(3); g2d.setStroke(s