Copy and paste image to and from System Clipboard

 
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;

import javax.swing.ImageIcon;

public class Main {
  public static void main(String[] argv) throws Exception {

    ImageSelection imgSel = new ImageSelection(new ImageIcon("a.png").getImage());
    Toolkit.getDefaultToolkit().getSystemClipboard().setContents(imgSel, null);

    Transferable t = Toolkit.getDefaultToolkit().getSystemClipboard()
        .getContents(null);

    if (t != null && t.isDataFlavorSupported(DataFlavor.imageFlavor)) {
      Image img = (Image) t.getTransferData(DataFlavor.imageFlavor);
    }

  }
}

class ImageSelection implements Transferable {
  private Image image;

  public ImageSelection(Image image) {
    this.image = image;
  }

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

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

  public Object getTransferData(DataFlavor flavor)
      throws UnsupportedFlavorException, IOException {
    if (!DataFlavor.imageFlavor.equals(flavor)) {
      throw new UnsupportedFlavorException(flavor);
    }
    return image;
  }
}