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Whats the error in my program-creating overlapping GOval objects using GraphicsProgram

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I am trying to create three concentric circles of different color
using GraphicsProgram. However the circles never appear to be
concentric..they appear to be pushed off on the sides of each other as
if trying to show another dimension. I am simply creating and adding
the GOval objects. May be I am missing something. Is there a way to
set transparency of the circles?

Adding code below:

import acm.graphics.*;
import acm.program.*;
import java.awt.*;

public class Target extends GraphicsProgram {

    final static double radiusOuterCircle = 72.0;
    final static double radiusMiddleCircle = 47.0;
    final static double radiusInnerCircle = 22.0;


    public void run() {


        final double centerX = this.getWidth() / 2.0;
        final double centerY = this.getHeight() / 2.0;


        GOval g = makeCircle(centerX, centerY,radiusOuterCircle ,
Color.RED);
        add(g);


        g = makeCircle(centerX, centerY,radiusMiddleCircle ,
Color.WHITE);
        add(g);


        g = makeCircle(centerX, centerY,radiusInnerCircle ,
Color.RED);
        add(g);


    }



    private GOval makeCircle(double centerX, double centerY, double
radius, Color color)
    {

        GOval g = new GOval(centerX, centerY, radius, radius);
        g.setFillColor(color);
        g.setFilled(true);

        return g;

    }
}

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Whats the error in my program-creating overlapping GOval objects using GraphicsProgram student <freenow12345@gmail.com> - 2012-01-20 17:05 -0800
  Re: Whats the error in my program-creating overlapping GOval objects using GraphicsProgram Jeff Higgins <jeff@invalid.invalid> - 2012-01-20 21:52 -0500
    Re: Whats the error in my program-creating overlapping GOval objects using GraphicsProgram student <freenow12345@gmail.com> - 2012-01-20 22:19 -0800
      Re: Whats the error in my program-creating overlapping GOval objects using GraphicsProgram Lew <noone@lewscanon.com> - 2012-01-20 22:48 -0800
      Re: Whats the error in my program-creating overlapping GOval objects using GraphicsProgram Jeff Higgins <jeff@invalid.invalid> - 2012-01-21 05:51 -0500
        Re: Whats the error in my program-creating overlapping GOval objects using GraphicsProgram student <freenow12345@gmail.com> - 2012-01-21 18:08 -0800
  Re: Whats the error in my program-creating overlapping GOval objects using GraphicsProgram Rajiv Gupta <rajiv@invalid.com> - 2012-01-21 14:43 +1100

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