Importing and making an image the background of my program

Below is my code; coinciding with that how would i import an image and make it the background of my program. I have tried the drawing method but it failed. I was wondering if someone could help me?

package Control;

import java.awt.Color;

import javax.swing.JFrame;

public class Control extends JFrame {

    private static final long serialVersionUID = 1L;

    public Control() {
        setSize(500, 500);
        setTitle("Asteroid: Save Humanity");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setVisible(true);

    }

    public static void main(String[] args) {
        new Control();
    }

}