Looking to for info about checking the allbit of an image observer in Java/Swing

I am having an issue where I try and load some images using the ToolKit class, this is done like this:

  Toolkit tk = Toolkit.getDefaultToolkit();

  Image image = tk.createImage(imageFile.getPath());

but when I try to later draw these images onto my canvas (located inside JFrames) oftentimes it only draws some of the images on the canvas but it raises no exceptions. After a lot of investigation I am fairly convinced that the images are not done being loaded by the time they are being drawn but I am having trouble verifying this. I read in the documentation that there is a class called an ImageOberserver and if you check its property called 开发者_运维问答the Allbit this will tell you if the object is fully loaded but I have found no good example of how to do this or any good documentation describing this process.

Also, I have found that the toolkit that is returned when running this on my mac is apple.awt.CToolKit but I can find no documentation on this class either. Does anyone know if the CtoolKit creates a new thread when you run the method createImage? Does anyone know where I could find the docs for this class?

Images load incrementally, and may be animated. Typically you can just use javax.swing.ImageIcon. java.awt.MediaTracker is the traditional route to make sure an image has completed loading.