Possisionner JPanel dans Jframe java

package net.commentcamarche.samples;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Sample extends JFrame {

	private static final long serialVersionUID = 1L;

	public static void main(String args[]) {
		try {
			Sample frame = new Sample();
			frame.setVisible(true);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public Sample() {
		super();
		getContentPane().setLayout(null);
		setBounds(100, 100, 500, 375);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		final JPanel panel = new JPanel();
		panel.setBounds(158, 99, 264, 148);
		getContentPane().add(panel);
	}
}