如果将MouseListener直接添加到JLabel，则可以在JOptionPane中轻松显示按下的标签的图标：
@Overridepublic void mousePressed(MouseEvent mEvt) { JLabel label = (JLabel) mEvt.getSource(); Icon icon = label.getIcon(); JOptionPane.showMessageDialog(label, icon);}例如：
import java.awt.GridLayout;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.image.BufferedImage;import java.io.IOException;import java.net.URL;import java.util.ArrayList;import java.util.List;import javax.imageio.ImageIO;import javax.swing.*;public class FooMouseListener extends JPanel { private GetImages getImages; public FooMouseListener() throws IOException { getImages = new GetImages(); setLayout(new GridLayout(GetImages.SPRITE_ROWS, GetImages.SPRITE_COLS)); MyMouseAdapter myMouseAdapter = new MyMouseAdapter(); for (int i = 0; i < GetImages.SPRITE_CELLS; i++) { JLabel label = new JLabel(getImages.getIcon(i)); add(label); label.addMouseListener(myMouseAdapter); } } private class MyMouseAdapter extends MouseAdapter { @Override public void mousePressed(MouseEvent e) { JLabel label = (JLabel) e.getSource(); Icon icon = label.getIcon(); JOptionPane.showMessageDialog(label, icon, "Selected Icon", JOptionPane.PLAIN_MESSAGE); } } private static void createAndShowGui() { FooMouseListener mainPanel = null; try { mainPanel = new FooMouseListener(); } catch (IOException e) { e.printStackTrace(); System.exit(-1); } Jframe frame = new Jframe("FooMouseListener"); frame.setDefaultCloseOperation(Jframe.DISPOSE_ON_CLOSE); frame.getContentPane().add(mainPanel); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); }}class GetImages { private static final String SPRITE_PATH = "http://th02.deviantart.net/" + "fs70/PRE/i/2011/169/0/8/blue_player_sprite_sheet_by_resetado-d3j7zba.png"; public static final int SPRITE_ROWS = 6; public static final int SPRITE_COLS = 6; public static final int SPRITE_CELLS = SPRITE_COLS * SPRITE_ROWS; private List<Icon> iconList = new ArrayList<>(); public GetImages() throws IOException { URL imgUrl = new URL(SPRITE_PATH); BufferedImage mainImage = ImageIO.read(imgUrl); for (int i = 0; i < SPRITE_CELLS; i++) { int row = i / SPRITE_COLS; int col = i % SPRITE_COLS; int x = (int) (((double) mainImage.getWidth() * col) / SPRITE_COLS); int y = (int) ((double) (mainImage.getHeight() * row) / SPRITE_ROWS); int w = (int) ((double) mainImage.getWidth() / SPRITE_COLS); int h = (int) ((double) mainImage.getHeight() / SPRITE_ROWS); BufferedImage img = mainImage.getSubimage(x, y, w, h); ImageIcon icon = new ImageIcon(img); iconList.add(icon); } } // get the Icon from the List at index position public Icon getIcon(int index) { if (index < 0 || index >= iconList.size()) { throw new ArrayIndexOutOfBoundsException(index); } return iconList.get(index); } public int getIconListSize() { return iconList.size(); }}
