70_DragAndDrop

<Main.java>
public class Main {
    public static void main(String[] args){

        MyFram myFram = new MyFram();
    }
}

<MyFram.java>
import javax.swing.*;

public class MyFram extends JFrame {
    DragPanel dragPanel = new DragPanel();
    MyFram(){
        this.add(dragPanel);
        this.setTitle("Drag & Drop demo");
        this.setSize(600,600);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);
    }
}

<DragPanel.java>
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

public class DragPanel extends JPanel {
    ImageIcon image = new ImageIcon("smiley.png");
    final int WIDTH = image.getIconWidth();
    final int HEIGHT = image.getIconHeight();
    Point imageCorner;
    Point prevPt;

    DragPanel() {
        imageCorner = new Point(0, 0);
        ClickListener clickListener = new ClickListener();
        DragListener dragListener = new DragListener();
        this.addMouseListener(clickListener);
        this.addMouseMotionListener(dragListener);

    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        image.paintIcon(this, g, (int) imageCorner.getX(), (int) imageCorner.getY());


    }

    //Create 2 inner class
    private class ClickListener extends MouseAdapter {//wait until we click the mouse

        public void mousePressed(MouseEvent e) {
            prevPt = e.getPoint();

        }
    }

    private class DragListener extends MouseMotionAdapter {//move image as we move mouse around
        public void mouseDragged(MouseEvent e){
            Point currentPt = e.getPoint();
            imageCorner.translate(
                    (int)(currentPt.getX()-prevPt.getX()),
                    (int)(currentPt.getY()-prevPt.getY())
            );
            prevPt = currentPt;
            repaint();
        }
    }
}