Re: Test Driven Development By Example Query

Think classes, not objects. The Equals method defined by class Franc can access member variables of class Franc.

Same as C++.

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C. Keith Ray
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On 2014 Nov 11, at 8:25 AM, Aaron Carey [email protected] [testdrivendevelopment] <[email protected]> wrote:

> 
> Hi,
> 
> I'm sorry this may be a rather stupid question, but it's been bugging me as I'm reading through Kent Beck's book 'Test-Driven Development By Example'
> 
> I think it might be my understanding of Java (I have a C++/Python background) but I was really hoping someone could clear something up!
> 
> This happens a few times in the book so far, but here's an example:
> 
> on Page 24, there's a Franc class which defines equals and sets the amount variable as a private int. Within the equals method a Franc object passed into the method has the amount variable queried. How does this work? I thought private variables couldn't be accessed outside of the object, but here you query it from another object? Is there some sort of friend class behaviour?
> 
> Thanks so much for your help!
> 
> class Franc {
>     private int amount;
> 
>     Franc(int amount) {
>         this.amount= amount;
>     }
> 
>     public boolean equals(Object object) {
>         Franc franc= (Franc) object;
>         return amount == franc.amount;
>     }
> }
> 
>