Issues Drawing Image

Question

Okay, so I've made a JPanel based class, but whenever I try to draw an image, it just comes up blank. Now, I know it can read the image because if I place the wrong path or name, it gives an error, but I think perhaps I'm doing something else wrong... Actually, I'm sure of it. Here's my code I've come up with:
package planets;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import javax.swing.JPanel;
public class image extends JPanel {
     private static final long serialVersionUID = 1L;
     private Image img;;
     public image() {
          this.img = Toolkit.getDefaultToolkit().getImage("earth.gif");
     public void changeImage(Image img) {
          this.img = img;
          repaint();
     @Override
     public void paintComponent(Graphics g) {
          g.drawImage(img, super.getWidth()/2-150, super.getHeight()/2-150, this);
     }What could I possibly have wrong?
Edit: I thought I might go ahead and put the code tags in for everybody's general sanity.

Answer 1

First of all learn Java naming standards. "image" is not a standard class name.
What could I possibly have wrong?Well, we don't know for sure because you don't show us how the panel is actually used in your program.
In the future, and for more help create a [url http://sscce.org]SSCCE, that demonstrates the incorrect behaviour.
As a guess, many layout managers use the preferred size of a component. You didn't specify a preferred size (or override the getPreferredSize() method) and the default size is 0 so Swing thinks there is nothing to paint. Add the following:
setPreferredSize( new Dimension(?, ?) );