更改ImageIcon对象透明度(alpha)

import java.awt.*;
import java.awt.image.*;
import javax.swing.*;

public class ImageIconAlpha {
    public static void main(String[] args) {
        JFrame frame = new JFrame("ImageIcon Alpha");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 200);

        ImageIcon originalIcon = new ImageIcon("path/to/image.png");
        ImageIcon alphaIcon = createAlphaIcon(originalIcon, 0.5f);

        JLabel originalLabel = new JLabel(originalIcon);
        JLabel alphaLabel = new JLabel(alphaIcon);

        frame.getContentPane().setLayout(new FlowLayout());
        frame.getContentPane().add(originalLabel);
        frame.getContentPane().add(alphaLabel);

        frame.setVisible(true);
    }

    public static ImageIcon createAlphaIcon(ImageIcon icon, float alpha) {
        int w = icon.getIconWidth();
        int h = icon.getIconHeight();
        BufferedImage bimage = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = bimage.createGraphics();
        g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha));
        icon.paintIcon(null, g2, 0, 0);
        g2.dispose();
        return new ImageIcon(bimage);
    }
}