Circle class not drawing circle

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Graphics;
import java.awt.Color.*;

public class Circle extends JPanel{
	
	public void point(Graphics g){
		setSize(500,500);
		g.drawOval(100, 100, 100, 100); 
	}
	
	public static void main (String [] args){
		JFrame MainFrame = new JFrame();
		MainFrame.setSize(600, 600);
		Circle CirclePanel = new Circle();
		MainFrame.add(CirclePanel);
		MainFrame.setVisible(true);
	}
}