j.l.r.Parameter.hashCode() question

[Joe Darcy]

On 10/28/2013 08:55 AM, elena votchennikova wrote:
> Hello Joe,
>
> On 25.10.2013 21:11, Joe Darcy wrote:
>>
>>>
>>>>> On 04.10.2013 5:03, Joseph Darcy wrote:
>>>>>> The phrased "based on" means "some unspecified function of."
>>>>>
>>>>
>>>
>> I don't really see how the equals contract saying "Compares based on 
>> the executable and the index" could lead a reasonable programmer to 
>> code up something that was not equivalent to 
>> "other.executable.equals(executable) && other.index == index".
>>
>
> "Compares based on the executable and the index" means
> someFunction(Executable executable, int index, ???)
>
> I cannot say nothing about the implementation of this "someFunction".
>
>

If on an exam you were posed the question:

"Equality for the Parameter class compares on the executable and the 
index. Write an equals method for the Parameter class that satisfies the 
general equals contract."

and you answer did not include something like

...
     return this.executable.equals(that.executable) && this.index == 
that.index

your answer would be marked wrong. There is no other way to satisfy the 
constraints of the problem.

-Joe