Snapper.java

import java.awt.Color;
import java.awt.Dimension;
import java.awt.MouseInfo;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.imageio.ImageIO;
import javax.swing.*;

public class Main {
    static JFrame frame2 = new JFrame();
    static Point p;
    static Point R;
    static Point D;
    static int Finaly;
    static int Startx;
    static int Starty;
    static int Finalx;
    static JTextField jt = new JTextField();
    static SimpleDateFormat sdf = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss");
	private static String path="W:"; //Need to change drive as per your machine
    public static void main(String[] args) {
        Main cS = new Main();
        cS.SnapTaker();
    }
    public void SnapTaker() {
        Dimension scrSize = Toolkit.getDefaultToolkit().getScreenSize(); // size of the screen
        frame2.setBounds(0, 0, scrSize.width, scrSize.height);
        frame2.getContentPane().setLayout(null);
        frame2.setAlwaysOnTop(true);
        frame2.setUndecorated(true);
        frame2.setBackground(new Color(Color.black.getRed(), Color.black.getGreen(), Color.black.getBlue(), 1));
        frame2.getContentPane().setBackground(new Color(Color.black.getRed(), Color.black.getGreen(), Color.black.getBlue(), 50));
        ((JComponent) frame2.getContentPane()).setBorder(
            BorderFactory.createMatteBorder(2, 2, 2, 2, Color.black));
        frame2.setType(javax.swing.JFrame.Type.UTILITY);
//        frame2.setAlwaysOnTop(true);

        jt.setBounds(0, 0, 0, 0);
        jt.addMouseListener(mouseListener);
        jt.setBorder(BorderFactory.createMatteBorder(2, 2, 2, 2, Color.black));
        jt.addMouseMotionListener(mouseListener);
        jt.setEditable(false);
        jt.setBackground(new Color(Color.black.getRed(), Color.black.getGreen(), Color.black.getBlue(), 0));
        frame2.getContentPane().add(jt);

        final JLabel cloesButton = new JLabel("Close");
        cloesButton.setForeground(Color.red);
        cloesButton.setToolTipText("Close");
        cloesButton.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent arg0) {
                frame2.dispose();
            }
            @Override
            public void mouseEntered(MouseEvent arg0) {
                cloesButton.setForeground(Color.red);
            }
            @Override
            public void mouseExited(MouseEvent arg0) {
                cloesButton.setForeground(Color.white);
            }
        });
        cloesButton.setSize(15, 15);
        cloesButton.setBounds(scrSize.width - 40, 0, 40, 20);

        final JLabel Snap = new JLabel("Take Snap");
//        Snap.setIcon(new ImageIcon(RscLoader.getImage("cam.jpg")));
//        Snap.setForeground(Color.white);
        Snap.setToolTipText("Take Snap");
        Snap.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent arg0) {
                takeSnap();
            }
            @Override
            public void mouseEntered(MouseEvent arg0) {
                Snap.setForeground(Color.GREEN);
            }
            @Override
            public void mouseExited(MouseEvent arg0) {
                Snap.setForeground(Color.white);
            }
        });
        Snap.setBounds(scrSize.width - 120,0, 80, 20);
        frame2.getContentPane().add(Snap);

        frame2.addMouseListener(new MouseAdapter() {

            @Override
            public void mousePressed(MouseEvent arg0) {
                p = MouseInfo.getPointerInfo().getLocation();
                //jt.setBounds(0,0,p.x,p.y);
            }
            @Override
            public void mouseReleased(MouseEvent arg0) {
                R = MouseInfo.getPointerInfo().getLocation();
                jt.setBounds(p.x, p.y, R.x - p.x, R.y - p.y);
            }
        });
        frame2.getContentPane().add(cloesButton);
        frame2.setVisible(true);

    }
    private final static void takeSnap() {
        try {
            Robot robot = new Robot();
            Rectangle area = new Rectangle(jt.getBounds());
            BufferedImage bufferedImage = robot.createScreenCapture(area);
            File file = new File(path+"\\screenshot_"+sdf.format(new Date())+".png");
            boolean i = ImageIO.write(bufferedImage, "jpg", file);
            if (i) {
                JOptionPane.showMessageDialog(frame2, "Snapshot Taken Sucessfully !!");
            }
        } catch (Exception e) {
            JOptionPane.showMessageDialog(frame2, "Error Taking Snapshot !!");
            e.printStackTrace();
        }
    }
    private final static MouseAdapter mouseListener = new MouseAdapter() {
        int x, y;
        @Override
        public void mousePressed(MouseEvent e) {
            if (e.getButton() == MouseEvent.BUTTON1) {
                x = e.getX();
                y = e.getY();
            }
        }

        @Override
        public void mouseDragged(MouseEvent e) {
            if ((e.getModifiersEx() & MouseEvent.BUTTON1_DOWN_MASK) != 0) {
                jt.setLocation(e.getXOnScreen() - x, e.getYOnScreen() - y);
            }
        }
    };

}