repaint() looks choppy in my animation

[Kurasu]

Hi, I am relatively new to java.

I am making a side-scroller game in java, along with a few other people. I am animating the character that the user controls, but when it repaints, it looks horrible. I have white lines that show up between frames. I know there must be a way to fix this. If someone could give me some suggestions, it would be greatly appreciated.

[Phaelax]

double buffering