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Use ImageObserver interface, ImageObserver is an interface used to receive notification as an image is being generated. ImageObserver defines only one method: imageUpdate(). The following code waits until the image is completely loaded before snapping it onto the screen in a single repaint.
public boolean imageUpdate(Image img, int flags, int x, int y, int w, int h){
if ((flags & ALLBITS) != 0{
repaint();
} else if (flags & (ABORT|ERROR)) != 0){
error = true; //file not found
repaint();
}
return (flags & (ALLBITS|ABORT|ERROR)) == 0;
}