Inserting an image into a JLabel

Hello everyone, Ive been trying to add an image into a program ive been working on.
Im new to working with GUIs so this is all a bit confusing. When i run it all i see is the black box i created. Any advice? Also i have the image saved in the same location as the .java and .class file because i wasnt sure which it had to be with.

import java.awt.*;
import javax.swing.*;
public class SplashScreen {
	public static void main(String[]args){
		JFrame frame = new JFrame ("DNA Trait Predictions");
		frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
		
		JPanel primary = new JPanel();
		primary.setBackground(Color.black);
		primary.setPreferredSize(new Dimension(1000,500));
		
		ImageIcon icon = new ImageIcon("DNA.jpg");
		JLabel dna = new JLabel("True Source Code",icon,SwingConstants.CENTER);
		
		JPanel panel = new JPanel();
		panel.setBackground(Color.black);
		panel.setPreferredSize(new Dimension(200,200));
		frame.add(dna);
		frame.getContentPane().add(primary);
		frame.getContentPane().add(panel);
		frame.pack();
		frame.setVisible(true);
		
	}
}