JButton 美化，主要实现圆角矩形，根据鼠标动作变化，主要代码： Graphics2D g2d = (Graphics2D) g; g2d.setColor(Color.GREEN); g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2d.fillRoundRect(0, 0, 100, 30, 15, 15); g2d.setColor(Color.RED); Font font = new Fo