JPanel不会加载图像？

import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;

public class ImagePanel extends JPanel {
    private BufferedImage image;

    public ImagePanel(String imagePath) {
        try {
            image = ImageIO.read(new File(imagePath));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(image, 0, 0, null);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Image Panel");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 400);

        ImagePanel panel = new ImagePanel("image.jpg");
        frame.add(panel);

        frame.setVisible(true);
    }
}