i have two solutions might help you :

import javax.imageio.ImageIO ;
import javax.swing.JPanel ;
import java.awt.image.BufferedImage ;
import javax.swing.ImageIcon ;
import java.awt.Graphics ;
import java.awt.Graphics2D ;
import java.io.IOException ;

public class LoadImage extends JPanel {
    BufferedImage bufferedImage ;
    ImageIcon image ;
    public LoadImage()  {
        // If you want to load your image inside the resources, do this
        try {
            bufferedImage = ImageIO.read(getClass().getResourceAsStream("/your/location.png"));
        } catch (IOException e) {
            e.printStackTrace() ;
        }

        // do this if you want to load your image outside the program
        image = new ImageIcon("path/to/your/location.png") ;
    }


    @Override
    public void paintComponent(Graphics g) {
        // for bufferedImage 
        if (bufferedImage != null) {
            g.drawImage(bufferedImage, 0, 0, null) ;
        }
        // for image 
        if (image != null) {
            g.drawImage(image.getImage(), 0, 0, null) ;
        }
    }
}

i have a library that can handle your loading files, saves, images, wav musics from various locations named JStreamLoader, you can check it if you want. JStreamLoader library on GitHub