This program demonstrates the transfer of images between a Java application and the system clipboard. : Image « 2D Graphics GUI « Java

This program demonstrates the transfer of images between a Java application and the system clipboard.

This program demonstrates the transfer of images between a Java application and the system clipboard.
   This program is a part of the companion code for Core Java 8th ed.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <>.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

 * This program demonstrates the transfer of images between a Java application and the system
 * clipboard.
 * @version 1.22 2007-08-16
 * @author Cay Horstmann
public class ImageTransferTest
   public static void main(String[] args)
      EventQueue.invokeLater(new Runnable()
            public void run()
               JFrame frame = new ImageTransferFrame();

 * This frame has an image label and buttons for copying and pasting an image.
class ImageTransferFrame extends JFrame
   public ImageTransferFrame()

      label = new JLabel();
      image = new BufferedImage(DEFAULT_WIDTH, DEFAULT_HEIGHT, BufferedImage.TYPE_INT_ARGB);
      Graphics g = image.getGraphics();
      g.fillRect(0, 0, DEFAULT_WIDTH, DEFAULT_HEIGHT);

      label.setIcon(new ImageIcon(image));
      add(new JScrollPane(label), BorderLayout.CENTER);
      JPanel panel = new JPanel();

      JButton copyButton = new JButton("Copy");
      copyButton.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent event)

      JButton pasteButton = new JButton("Paste");
      pasteButton.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent event)

      add(panel, BorderLayout.SOUTH);

    * Copies the current image to the system clipboard.
   private void copy()
      Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
      ImageTransferable selection = new ImageTransferable(image);
      clipboard.setContents(selection, null);

    * Pastes the image from the system clipboard into the image label.
   private void paste()
      Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
      DataFlavor flavor = DataFlavor.imageFlavor;
      if (clipboard.isDataFlavorAvailable(flavor))
            image = (Image) clipboard.getData(flavor);
            label.setIcon(new ImageIcon(image));
         catch (UnsupportedFlavorException exception)
            JOptionPane.showMessageDialog(this, exception);
         catch (IOException exception)
            JOptionPane.showMessageDialog(this, exception);

   private JLabel label;
   private Image image;

   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 300;

 * This class is a wrapper for the data transfer of image objects.
class ImageTransferable implements Transferable
    * Constructs the selection.
    * @param image an image
   public ImageTransferable(Image image)
      theImage = image;

   public DataFlavor[] getTransferDataFlavors()
      return new DataFlavor[] { DataFlavor.imageFlavor };

   public boolean isDataFlavorSupported(DataFlavor flavor)
      return flavor.equals(DataFlavor.imageFlavor);

   public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException
      if (flavor.equals(DataFlavor.imageFlavor))
         return theImage;
         throw new UnsupportedFlavorException(flavor);

   private Image theImage;


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