addNotify是否适合处理装饰？

Question

我有一个装饰模式对话框，显示与桌面对齐的屏幕截图：

import java.awt.*;
import java.awt.image.BufferedImage;
import javax.swing.*;
public class ImageDialog extends JDialog {
    public ImageDialog() throws AWTException {
        Rectangle screenArea = GraphicsEnvironment
                .getLocalGraphicsEnvironment().getDefaultScreenDevice()
                .getDefaultConfiguration().getBounds();
        BufferedImage image = new Robot().createScreenCapture(screenArea);

        ImagePanel panel = new ImagePanel(image);
        JScrollPane scrollPane = new JScrollPane(panel);
        getContentPane().add(scrollPane, BorderLayout.CENTER);

        setSize(400, 400);
        setLocation(100, 100);

        addNotify(); // XXX addNotify seems necessary. Better solution?

        Point p = new Point(getInsets().left, getInsets().top);
        SwingUtilities.convertPointToScreen(p, this);
        scrollPane.getViewport().setViewPosition(p);

        setModal(true);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setVisible(true);
    }
    private class ImagePanel extends JPanel {
        private BufferedImage image;
        public ImagePanel(BufferedImage image) {
            this.image = image;
        }
        @Override
        public Dimension getPreferredSize() {
            return new Dimension(image.getWidth(), image.getHeight());
        }
        @Override
        protected void paintComponent(Graphics g) {
            g.drawImage(image, 0, 0, this);
        }
    }
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    new ImageDialog();
                } catch (AWTException ignore) {
                }
                System.out.println("Done");
            }
        });
    }
}

我不想调用addNotify，因为document这么说，但如果我不这样做，屏幕截图就没有很好地对齐：_{（啊......周围的装饰品我的对话框）}

那么，这是一个我应该致电addNotify的案例，还是有更好的选择？