Something I'm not understanding about resizing labels

Main.java

package com.andrewwagner.chess.study;

import java.awt.Image;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Main {
	public static void main(String[] args) throws IOException{
		JFrame frame = new JFrame();
		final JPanel panel = new JPanel();
		
		final JLabel label = new JLabel();
		panel.add(label);

		frame.add(panel);
		
		frame.pack();
		frame.setVisible(true);
		
		Image image = ImageIO.read(new File("/Users/andrew/Downloads/Programming.jpg"));
		label.setIcon(new ImageIcon(image));
		label.revalidate();
		panel.revalidate();
	}
}