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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ShapeMoving extends JFrame {

ShapeMoving() {
        super("Shape Moving Demo");
        setSize(600, 600);
        add(new DrawingPanel());
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

private class DrawingPanel extends JPanel implements MouseMotionListener {
        
        private final int size = 100;
        private Rectangle shape = null;
        
        DrawingPanel() {
            addMouseMotionListener(this);
            addMouseListener(new MouseAdapter(){
                @Override
                public void mousePressed(MouseEvent me) {
                    int x = me.getX();
                    int y = me.getY();
                    if(!selectedExistingRectangle(x, y)) {
                        setRectangle(x, y);
                    }
                }
            });
        }
        
        @Override
        public void mouseDragged(MouseEvent me) {
            int x = me.getX();
            int y = me.getY();
            if(selectedExistingRectangle(x, y)) {
                setRectangle(x, y);
            }
        }

@Override
        public void mouseMoved(MouseEvent me) {}
        
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            if(shape == null) return;
            ((Graphics2D)g).fill(shape);
        }
        
        boolean selectedExistingRectangle(int x, int y) {
            return shape != null && shape.contains(x, y);
        }
        
        void setRectangle(int x, int y) {
            shape = new Rectangle(x-(size/2), y-(size/2), size, size);
            repaint();
        }
    }
    
    public static void main(String[] args) {
        new ShapeMoving();
    }
}