How would I add an action Listener to the button to refresh the image?

I have been trying to add an action listener to the "refresh" button but I don't know how I would be able to do this. What I am trying to do is add an action listener so that every time the button is clicked, a new image is taken from the array so the image is replaced with a new one.

public class hardMakeupGeneratorTwo extends JFrame{
private ImageIcon image1;
private JLabel label1;
private ImageIcon image2;
private JLabel label2;
private ImageIcon display;
private JButton refresh;

hardMakeupGeneratorTwo (){
	Random rand = new Random();
	setLayout(new FlowLayout());
	//image2 = new ImageIcon(getClass().getResource("second.jpg"));
	//image1 = new ImageIcon(getClass().getResource("first.jpg"));
	String[] images = new String[]{"second.jpg", "first.jpg", "IMG_0017.jpg", "IMG_0018.jpg", 
			"IMG_0019.JPG",
			"IMG_0020.JPG",
			"IMG_0021.JPG",
			"IMG_0022.jpg",
			"IMG_0023.jpg",
			"IMG_0024.jpg",
			"IMG_0025.jpg",
			"IMG_0026.jpg",
			"IMG_0027.jpg",
			"IMG_0028.jpg",
			"IMG_0029.jpg",
			"IMG_0030.jpg",
			"IMG_0031.jpg",
			"IMG_0032.jpg",
			"IMG_0033.JPG",
			"IMG_0034.JPG",
			"IMG_0035.JPG",
			"IMG_0036.JPG",
			"IMG_0037.JPG",
			"IMG_0038.JPG",
			"IMG_0039.PNG",
			"IMG_0040.jpg",
			"IMG_0041.JPG",
			"IMG_0042.JPG",
			"IMG_0045.jpg",
			"IMG_0044.jpg",
			"ninth.jpg", 
			"third.jpg", 
			"fourth.jpg", 
			"fifth.jpg",
			"sixth.jpg", 
			"seventh.jpg"};
    int randNum=rand.nextInt(images.length);
    display = new ImageIcon(getClass().getResource(images[randNum]));
	//image1 = new ImageIcon(getClass().getResource("first.jpg"));
	label1 = new JLabel(display);
	add(label1);
	refresh = new JButton("Refresh");
	add(refresh);
}  

public static void main (String args[]) {
	hardMakeupGeneratorTwo gui = new hardMakeupGeneratorTwo();
	gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	gui.setVisible(true);
	gui.pack();
	gui.setTitle("Here is your look, good luck!");

}
}