First GUI exercise

I am trying to draw a line using a for loop but for some reason i just cant figure out why, what im gettin instead its the last dot(pixel).

here is my code:

Java Code:

package com.mycompany;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MousePanel extends JPanel implements MouseListener{
        
    int pointX, pointY, oldX, oldY;

    public MousePanel(){
        super();
        addMouseListener(this);   
    }
    
    public void mouseClicked(MouseEvent mouse){
        
  
        // Tell the panel that we need to redraw things.
                oldX=pointX;
            oldY=pointY;
        // Get the location of the current mouse click.
            pointX = mouse.getX();
            pointY = mouse.getY();
        // Tell the panel that we need to redraw things.
            
            for (int i=0 ; i<50 ; i++)
            {
                pointX ++;
                repaint();
            
            }
            System.out.println("x:"+pointX+", y:"+pointY);
 
        }
    
    public void paintComponent(Graphics g){
        g.fillOval(pointX, pointY, 5, 5);
    }
    
    public void mouseEntered(MouseEvent mouse){ }   
    public void mouseExited(MouseEvent mouse){ }
    public void mousePressed(MouseEvent mouse){ }
    public void mouseReleased(MouseEvent mouse){ }

    public static void main(String arg[]){
        JFrame frame = new JFrame("MousePanel");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(640,400);

        MousePanel panel = new MousePanel();
        frame.setContentPane(panel);
        frame.setVisible(true);
    }
}

the

Java Code:

for (int i=0 ; i<50 ; i++)
            {
                pointX ++;
                repaint();
            
            }

its my try to print a line from the x and y of the first mouse click.































































































































































































































































































































































































































































































































can some please tell me what am i doing wrong?