Thread: Button not showing on panel?

I have three classes.. 1. panel class 2. frame class and 3. tester class

I am creating the objects like so but when I add button to panel then panel to frame I am not seeing the button. here is my code

import javax.swing.JButton;
import javax.swing.JPanel;
 
 
public class Panel extends JPanel{
 
	private JPanel p;
	private JButton b;
 
	public Panel(){
		p = new JPanel();
		b = new JButton("hey there");
		p.add(b);
	}
}

import javax.swing.JFrame;
 
 
public class Frame extends JFrame{
 
	private JFrame frame;
 
 
	public Frame(){
		frame = new JFrame();
		frame.setSize(400,600);
		frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
		frame.setVisible(true);
	}
 
}

public class Tester {
 
 
	public static void main(String args[]){
 
		ContactsArrayList list = new ContactsArrayList();
		Frame f = new Frame();
		Panel p = new Panel();
 
		f.add(p);
	}
}

Thank you very much sir.