Simple Animation

i have written the following applet to display a red and black chess board :

import java.awt.*;
import java.applet.*;

public class Checker extends Applet {

    public void paint(Graphics g) {
   
        int x,y,xint,yint;
        xint = 0;
        yint = 0;
   
        g.setColor(Color.black);
        g.fillRect(0,0,159,159);
       
        g.setColor(Color.red);
       
        for(y = 1; y <= 8; y++) {
            for(x = 1; x<=8; x++){
                if((((y % 2) == 0) && ((x % 2) == 0)) || (((y % 2) != 0) && ((x % 2) != 0))){
                    g.fillRect(xint,yint,20,20);
                }
                xint += 20;
            }
            yint +=20;
            xint = 0;
        }
    }
}

is there a way to tweak this so as to produce an animation where the squares alternate colors between red and black ?