How to do image snipping?

As like snipping tool I want to snip a portion of my screen. I tried with following code with this I can select the portion but not able to extract image:

 public class MySnipTool {

 public static Rectangle selectionBounds;
 public Graphics2D g2d;

public static void main(String[] args) {
    new MySnipTool();
}

public MySnipTool() {
    EventQueue.invokeLater(new Runnable() {
        @Override
        public void run() {
            try {
                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
            }

            JFrame frame = new JFrame("Testing");
            frame.setUndecorated(true);
            frame.setBackground(new Color(0, 0, 0, 0));
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setLayout(new BorderLayout());
            frame.add(new CapturePane());
            Rectangle bounds = getVirtualBounds();
            frame.setLocation(bounds.getLocation());
            frame.setSize(bounds.getSize());
            frame.setAlwaysOnTop(true);
            frame.setVisible(true);
        }
    });
}

public class CapturePane extends JPanel {

    private Point clickPoint;

    public CapturePane() {
        setOpaque(false);

        MouseAdapter mouseHandler = new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                if (SwingUtilities.isLeftMouseButton(e) && e.getClickCount() == 2) {
                    System.exit(0);
                }
            }

            @Override
            public void mousePressed(MouseEvent e) {
                clickPoint = e.getPoint();
                selectionBounds = null;
            }

            @Override
            public void mouseReleased(MouseEvent e) {
                clickPoint = null;
            }

            @Override
            public void mouseDragged(MouseEvent e) {
                Point dragPoint = e.getPoint();
                int x = Math.min(clickPoint.x, dragPoint.x);
                int y = Math.min(clickPoint.y, dragPoint.y);
                int width = Math.max(clickPoint.x - dragPoint.x, dragPoint.x - clickPoint.x);
                int height = Math.max(clickPoint.y - dragPoint.y, dragPoint.y - clickPoint.y);
                selectionBounds = new Rectangle(x, y, width, height);
                repaint();
              //  CropImage.cropMyImage(new BufferedImage("D:\\NetbeansProjects\\testing\\cropimage.jpg"), x, y, width, height);
            }
        };

        addMouseListener(mouseHandler);
        addMouseMotionListener(mouseHandler);
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g2d = (Graphics2D) g.create();
        g2d.setColor(new Color(255, 255, 255, 128));

        Area fill = new Area(new Rectangle(new Point(0, 0), getSize()));
        if (selectionBounds != null) {
            fill.subtract(new Area(selectionBounds));
        }
        g2d.fill(fill);
        if (selectionBounds != null) {
            g2d.setColor(Color.BLACK);
            g2d.draw(selectionBounds);
        }
        g2d.dispose();
    }


}

public static Rectangle getVirtualBounds() {
    Rectangle bounds = new Rectangle(0, 0, 0, 0);

    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice lstGDs[] = ge.getScreenDevices();
    for (GraphicsDevice gd : lstGDs) {
        bounds.add(gd.getDefaultConfiguration().getBounds());
    }
    return bounds;
}
}

I need to implement crop with the help of the snipping.