ArrayList Plotting Points

Hey Guys.. making a convex hull here with 100 random squares..or asterisks... but i wanted to first graph all of the radom points and start figuring out grahams scan algorithm by measuring the angles.

Any help?

Code :

import java.awt.*;
import java.util.ArrayList;
import java.util.Random;
import javax.swing.*;
 
 
 
public class Convex extends JFrame {
 
	public static int WIDTH = 500;
	public static int HEIGHT = 500;
	public static int POINTS = 100; 
 
 
	public static void main (String [] args)
	{
	Random r = new Random();
	ArrayList <Point> points = new ArrayList <Point>();
	for ( int i = 0; i<POINTS; i++){
		points.add(new Point(r.nextInt(WIDTH), r.nextInt(HEIGHT)));
 
	}
 
 
		// make the window
 
 
		JFrame frame = new JFrame("Convex");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Graph g = new Graph(WIDTH, HEIGHT, POINTS);
 
		frame.getContentPane().add(g);
		frame.pack();
		frame.setVisible(true);
 
	}
 
 
 
 
}

Code :

 
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
 
import javax.swing.JPanel;
 
import java.awt.*;
import java.util.ArrayList;
 
import javax.swing.*;
 
public class Graph extends JPanel {
 
	public int WIDTH, HEIGHT, POINTS;
	public Color BACKGROUND = Color.WHITE;
	public Color POINTCOLOR = Color.blue;
 
	public Graph(int i, int j, int p)
	{
		WIDTH = i;
		HEIGHT = j;
		POINTS = p;
 
		setPreferredSize(new Dimension(i,j));
 
	}
 
 
 
 
	public void paintComponent(Graphics g)
	{
 
		super.paintComponent(g);
		g.setColor(BACKGROUND);
		g.fillRect(0, 0, WIDTH, HEIGHT);
 
 
 
	}
 
 
 
}