无法使每个点具有不同的颜色，无法找出如何使每个点具有不同的颜色存储在arraylist中

Question

让每个点使用不同的随机颜色并保持相同的颜色，而不必使用dr.java更改每个点的相同颜色时遇到麻烦。它将反复将旧点和新点更改为相同的颜色，并在制作新点时将一个点保留为旧颜色

import java.util.ArrayList;
import javax.swing.JPanel;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;

public class DotsPanel extends JPanel
{
private final int SIZE = 6;  

private ArrayList<Point> pointList;


public DotsPanel()
{
  pointList = new ArrayList<Point>();

  addMouseMotionListener (new DotsListener());
  addMouseListener (new DotsListener());
  setBackground(Color.black);
  setPreferredSize(new Dimension(500, 500));
}

当我放置一个新的点时，它不能只画一个，它将旧的点也更改为新的颜色

public void paintComponent(Graphics page)
{ 


  super.paintComponent(page);

  Random rand= new Random();
 int r=rand.nextInt(255);
 int g=rand.nextInt(255);
 int b=rand.nextInt(255);
  page.setColor(new Color(r,g,b));


  for (Point spot : pointList)
  {

     page.fillOval(spot.x-SIZE, spot.y-SIZE, SIZE*2, SIZE*2);


  }
 }


  private class DotsListener implements MouseMotionListener, MouseListener
  {

  public void mouseDragged(MouseEvent event)
  {
     pointList.add(event.getPoint());

     repaint();
////////
///////    was unable to put the page color down here it would not recognize it.
  }
  public void mousePressed(MouseEvent event)
  {
     pointList.add(event.getPoint());

     repaint();
  }


  public void mouseClicked(MouseEvent event) {}
  public void mouseReleased(MouseEvent event) {}
  public void mouseEntered(MouseEvent event) {}
  public void mouseExited(MouseEvent event) {}
  public void mouseMoved(MouseEvent event) {}
  }
  }