Java 8 和 Mac OS (High Sierra) 在這里。我有以下類TextOverlayer，它從文件系統(tǒng)讀取圖像，并且需要將一些紅色文本覆蓋到圖像上，然后將該“覆蓋”圖像保存為文件系統(tǒng)上的不同文件：public class TextOverlayer implements ImageObserver {  public static void main(String[] args) throws IOException {      // Instantiate a TextOverlayer and read a source/input image from disk      TextOverlayer textOverlayer = new TextOverlayer();      BufferedImage bufferedImage = ImageIO.read(Paths.get("/User/myuser/pix/sourceImage.jpg").toFile());      // Lay some text over the image at specific coordinates      BufferedImage drawn = textOverlayer.drawText(bufferedImage, "Some text");      // Write the overlayed image to disk      File outputfile = new File("/User/myuser/pix/targetImage.jpg");      ImageIO.write(drawn, "jpg", outputfile);  }  private BufferedImage drawText(BufferedImage old, String text) {      int w = old.getWidth() / 3;      int h = old.getHeight() / 3;      BufferedImage img = new BufferedImage(              w, h, BufferedImage.TYPE_INT_ARGB);      Graphics2D g2d = img.createGraphics();      g2d.drawImage(old, 0, 0, w, h, this);      g2d.setPaint(Color.red);      g2d.setFont(new Font("Serif", Font.BOLD, 20));      FontMetrics fm = g2d.getFontMetrics();      int x = img.getWidth() - fm.stringWidth(text) - 5;      int y = fm.getHeight();      g2d.drawString(text, x, y);      g2d.dispose();      return img;  }  @Override  public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {      return false;  }}當(dāng)它運行時，不會拋出任何錯誤，并且targetImage.jpg會成功寫入磁盤，除了它只是一個小黑匣子的圖像。我本來期望targetImage.jpg與 完全相同sourceImage.jpg，只是在所需的坐標(biāo)（圖像內(nèi)）添加了一些額外的文本。有什么想法我會出錯嗎？