java JTextField美化Demo

实现圆角矩形边框，hint文字，主要代码： Graphics2D g2d=(Graphics2D) g; g2d.setStroke(new BasicStroke(2,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND)); g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,0.5f)); g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2d.setColor(borderColor); g2d.drawRoundRect(0, 0, c.getWidth()-4,c.getHeight()-4, 20, 20); JTextField textField = (JTextField) c; if ("".equals(textField.getText())) { g2d.setColor(Color.BLACK); g2d.drawString("请输入文字...", 10, 18); }