JFrame到图像而不显示JFrame

这是应该解决问题的代码段：

Component c; // the component you would like to print to a BufferedImageJframe frame = new Jframe();frame.setBackground(Color.WHITE);frame.setUndecorated(true);frame.getContentPane().add(c);frame.pack();BufferedImage bi = new BufferedImage(c.getWidth(), c.getHeight(), BufferedImage.TYPE_INT_ARGB);Graphics2D graphics = bi.createGraphics();c.print(graphics);graphics.dispose();frame.dispose();