Can I draw *.bmp, *.png in java.awt.canvas ?

Question

In paint method of my program, I get image from Toolkit like this:
public class CanCanvas extends Canvas{
//In loadImage method
Toolkit.getDefaultToolkit().getImage(
                    getClass().getClassLoader().getResource(
                              resource.getString("bg.jpg")));
//.... In paint method
if (image != null && image.size() > 0) {
               for (int j = 0; j < image.size(); j++) {
                    Image image1 = (Image) image.elementAt(j);
                    Rectangle rectangle = (Rectangle) imgLocation.elementAt(j);
                    g.drawImage(image1, rectangle.x, offset + rectangle.y,
                              rectangle.width, rectangle.height, null);
                    i = i <= rectangle.y + rectangle.height + 7 ? rectangle.y
                              + rectangle.height + 7 : i;But there is something very strange, if my image is *.jpg or *.gif, it runs ok, otherwise -*.bmp, *.png-, it can't draw the image.
Would anyone tell me why ? Is the reason java.awt.canvas ?
Thanks in advance ^ ^

Answer 1

If you'd bother to read the documentation of the methods you're using, you'd know:
http://java.sun.com/j2se/1.4.2/docs/api/java/awt/Toolkit.html#getImage(java.lang.String)
Returns an image which gets pixel data from the specified file, whose format can be either GIF, JPEG or PNG.