Raja,
The way I approached the Ford manufacturerDiscount was to turn it into a percentage rather than a fixed value (as that's what the other examples used and the assignment was ambiguous).
pxk,
Calling the super getSalePrice method allows us to take advantage of the existing code and augment it with the additional steps we need, so it's good re-use. Also, the this reference would could cause problems like getting into an endless loop (depending upon logic in the method).
Brenden
| [email protected]
Sent by: [email protected] 18/02/2009 05:46 AM
|
|
Why don't you try it with this.getSalePrice() instead of
super.getSalePrice()?
On Feb 17, 2:24 pm, Raja Krishnamoorthy <[email protected]> wrote:
> Hi, I have a question on the Homework Exercise:
> one of the points says:
>
> - Create a subclass of Car class and name it as Ford. The Ford class has
> the following fields and methods
> - int year;
> - int manufacturerDiscount;
> - double getSalePrice(); // From the sale price computed from Car
> class, subtract the manufacturerDiscount.
>
> The problem that I see with this exercise is that if Ford is a sub-class of
> Car, then we over0ride the method getSalePrice() in the Car class.
> Since Car is the super class, this method may return 0, since it can be
> overridden.
> So in the Ford sub class if I code the method as follows:
> public double getSalePrice(){
> return super.getSalePrice() - manufacturerDiscount;
> }
>
> Then I will get a negative value for price.
>
> Should Ford be a sub-class of Truck class?
>
> Thanks
>
> Raja
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