Java Swing:在Jar中显示图像

import javax.swing.*;
import java.awt.*;
import java.net.URL;

public class ImageDemo {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> createGUI());
    }

    private static void createGUI() {
        JFrame frame = new JFrame("Image Demo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 300);

        URL imageUrl = ImageDemo.class.getResource("/path/to/image/file.png");
        ImageIcon imageIcon = new ImageIcon(imageUrl);
        JLabel label = new JLabel(imageIcon);

        frame.getContentPane().add(label, BorderLayout.CENTER);
        frame.setVisible(true);
    }
}