如何在JPanel中自动调整图形大小？

import javax.swing.*;
import java.awt.*;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

public class AutoResizePanel extends JPanel {
    private Image image;

    public AutoResizePanel() {
        // 加载图像
        image = Toolkit.getDefaultToolkit().getImage("image.jpg");

        // 添加组件监听器
        addComponentListener(new ComponentAdapter() {
            @Override
            public void componentResized(ComponentEvent e) {
                // 重绘图像
                repaint();
            }
        });
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        // 获取JPanel的大小
        int panelWidth = getWidth();
        int panelHeight = getHeight();

        // 计算图像的缩放比例
        int imageWidth = image.getWidth(this);
        int imageHeight = image.getHeight(this);
        double scaleX = (double) panelWidth / imageWidth;
        double scaleY = (double) panelHeight / imageHeight;
        double scale = Math.min(scaleX, scaleY);

        // 计算调整后的图像大小
        int scaledWidth = (int) (imageWidth * scale);
        int scaledHeight = (int) (imageHeight * scale);

        // 计算图像的位置
        int x = (panelWidth - scaledWidth) / 2;
        int y = (panelHeight - scaledHeight) / 2;

        // 绘制图像
        g.drawImage(image, x, y, scaledWidth, scaledHeight, this);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Auto Resize Panel");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        AutoResizePanel panel = new AutoResizePanel();
        frame.add(panel);

        frame.setSize(400, 300);
        frame.setVisible(true);
    }
}