A flickering problem

I've got a game GUI and need to use the paint() and repaint methods. But I get a very annoying flicker on my screen. I saw a method called update but don't know how it works or what to do with it. Any one tell me what it does or any other way to get rid of this flickering?

update(Graphics g){
   paint(g);
}[\code]                                                                                                                                                                                                                   

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