I need help with making a method to get a white circle with a black
background.
On clicking a button the circle turns to black On clicking the button
again it turns back to the white circle with a black background  again.

import aLibrary.*;
import java.awt.event.*;
import java.awt.Color;

public class DotBW extends Dot{
   private AOval theDot;

   public DotBW(int a, int b){
               super(a, b, 50, 50);
               //theDot = new AOval();
               setColor(Color.black);
   }
public  void action(){

   Color fillColor = this.getColor();

       if (fillColor == Color.black) {
           this.setToFill();
           //this.setColor(Color.white);
           //this.setToFill(Color.white);
       } else {
           //this.repaint();
           this.setColor(Color.black);
           this.setToFill();
           }
           this.repaint();
       }//end if
}//end class