Rien ne s'affiche sur ma fentre Java.

package fentre;

import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class main extends JFrame {
 
 private static final long serialVersionUID = 1L;
 public static void main(final String[] args) {
  SwingUtilities.invokeLater(new Runnable(){
 public void run(){
   new Frame("A");
   }
 });
  }
}

package fentre;

import java.awt.Color;
import java.awt.Graphics;

import javax.swing.JPanel;

public class  panel extends JPanel{

   /**
*
*/
 private static final long serialVersionUID = 1L;

public void paintComponant (Graphics go) {
    go.setColor(Color.green);  
 go.fillRect(16, 16, 25, 25);


     }

   }

package fentre;

import java.awt.Panel;

import javax.swing.JFrame;

public class Frame extends JFrame {

 /**
* 
*/
 private static final long serialVersionUID = 1L;
  public Frame(String title) {
  setTitle(title);
  setVisible(true);
    setSize(1400 , 1000);
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  setLocationRelativeTo(null);
     add(new Panel());
  
  
  }
  

}