Painter

package Paint;

import javax.swing.*;

import java.awt.*;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseEvent;

public class DrawArea extends JFrame implements MouseMotionListener {

    private int x = -10, y = -10;

    public DrawArea() {
        setTitle("Painter");
        setSize(800, 600);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        //layout
        JLabel instructions = new JLabel("Drag the mouse to draw", JLabel.RIGHT);
        Container c = this.getContentPane();
        c.setLayout(new BorderLayout());
        c.add(instructions, BorderLayout.SOUTH);
        //mouse configuration
        c.addMouseMotionListener(this);

        setVisible(true);
    }

    public void mouseMoved(MouseEvent e) {

    }

    public void mouseDragged(MouseEvent e) {

        x = e.getX();
        y = e.getY();
        repaint();
    }

    public void paint(Graphics g)
    {
        g.fillOval(x, y, 4, 4);
    }
    public static void main (String args[])
    {
        Painter p = new Painter() {
            @Override
            public void paint(Graphics2D graphics2D, Object o, int i, int i1) {

            }
        };
    }

}