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Re: "How do you arrive at classes?"

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On 1/14/2015 9:36 PM, Stefan Ram wrote:
> ram@zedat.fu-berlin.de (Stefan Ram) writes:
>> Now, a student asked me: »How do you arrive at classes?«,
>
>    Thank you all for your answers!
>
>    I have written a German-language web page to answer
>    the question. Here are some parts of it in English:
> [...]
>    3. hints
> [...]
>    - find fields (variables) that belong together and
>      group them into one class, than add methods for them

     Sometimes it's the other way around: You start from the
behaviors you want to model, and from those you discover what
fields the class will need to support those behaviors.  That
is, you sometimes begin with the methods and derive the fields.

     Perhaps the clearest example of behaviors-then-data as
opposed to data-then-behaviors is in implementing an interface:
The interface says nothing about the data and everything (well,
everything it can) about the methods.  If you are implementing
the Iterator interface you must write hasNext() and next(), and
although it's clear that you must keep track of the iteration's
progress there's no specification of what sort of data you must
maintain to do so.

     From the perspective of the Java language (not necessarily
that of all O.O.P. frameworks), methods and fields are simply
"members" of their classes; they are peers, without primacy.

-- 
esosman@comcast-dot-net.invalid
"Don't be afraid of work. Make work afraid of you." -- TLM

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Re: "How do you arrive at classes?" Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-01-15 08:43 -0500
  Re: "How do you arrive at classes?" Martin Gregorie <martin@address-in-sig.invalid> - 2015-01-15 14:28 +0000

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