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Re: A question about a few variables in a class

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Date	Sun, 14 Aug 2011 18:36:13 -0700
From	Patricia Shanahan <pats@acm.org>
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On 8/5/2011 2:31 PM, Chad wrote:
> Let's say I have the following class.....
>
>
> public class ComparableRectangle extends Rectangle implements
> Comparable {
>    public ComparableRectangle(double width, double height) {
>      super(width, height);
>    }
>
>    public int compareTo(Object o) {
>      if (getArea()>  ((ComparableRectangle)o).getArea())
>        return 1;
>      else if (getArea()<  ((ComparableRectangle)o).getArea())
>        return -1;
>      else
>        return 0;
>    }
> }
>
>
> Are 'width' and 'height' data fields in this class? My initial guess
> is yes. However, the fact that they are passed to super() makes me
> wonder otherwise.

If "Rectangle" above is the same as Rectangle1 in your recent message,
the answer is that width and height are not members of
ComparableRectangle, because private fields are not inherited by subclasses.

On the other hand, the getWidth, setWidth, getHeight, and setHeight
methods in Rectangle are inherited members of ComparableRectangle.
ComparableRectangle can operate on its width and height attributes
through those methods, it just can't see how the information is
implemented in Rectangle.

Patricia

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A question about a few variables in a class Chad <cdalten@gmail.com> - 2011-08-05 14:31 -0700
  Re: A question about a few variables in a class markspace <-@.> - 2011-08-05 14:46 -0700
  Re: A question about a few variables in a class Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-06 07:56 -0400
    Re: A question about a few variables in a class Chad <cdalten@gmail.com> - 2011-08-13 10:30 -0700
      Re: A question about a few variables in a class Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-13 20:49 -0400
        Re: A question about a few variables in a class Chad <cdalten@gmail.com> - 2011-08-14 13:23 -0700
          Re: A question about a few variables in a class markspace <-@.> - 2011-08-14 13:52 -0700
            Re: A question about a few variables in a class Lew <lewbloch@gmail.com> - 2011-08-14 22:50 -0700
          Re: A question about a few variables in a class Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-14 18:04 -0400
            Re: A question about a few variables in a class Chad <cdalten@gmail.com> - 2011-08-14 17:09 -0700
              Re: A question about a few variables in a class Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-14 21:57 -0400
              Re: A question about a few variables in a class Lew <lewbloch@gmail.com> - 2011-08-14 22:55 -0700
          Re: A question about a few variables in a class Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-14 18:01 -0400
  Re: A question about a few variables in a class Roedy Green <see_website@mindprod.com.invalid> - 2011-08-06 22:58 -0700
    Re: A question about a few variables in a class Patricia Shanahan <pats@acm.org> - 2011-08-07 05:28 -0700
  Re: A question about a few variables in a class Lew <lewbloch@gmail.com> - 2011-08-10 09:14 -0700
    Re: A question about a few variables in a class Chad <cdalten@gmail.com> - 2011-08-13 10:27 -0700
  Re: A question about a few variables in a class Patricia Shanahan <pats@acm.org> - 2011-08-14 18:36 -0700

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