Thanks for danielmfreitas !~~

I see, thanks a lot

I see, thanks a lot.  
Another question I want to ask is what is the difference between repaint() and flushGraphics() ?
Thanks

After I moves my Sprite from one place to another,
the original Sprite did not deleted and exists in the Canvas.
So, my question is Should I need to apply LayerManger.remove(Sprite) method to delete the original Sprite everytime?
If I apply paint's drawImage, I only can apply repaint() to eliminate the orginal picture.
Can I apply repaint() instead of LayerManger.remove(Sprite) ?
Thank you~

Excuse me, I am a beginner of MIDP game programming.
If I want to produce an animation which only moves an image from left to right and move 1 per time, how should I do?
Thanks