[ajug-members] design theory

[Bentley, Jeff]

Ok. I'll bite.

Imagine you have some service you need to implement called
NuclearWeaponControl.
It has one method called "public void detonate(GPSCoordinates
coordinates) throws CantDetonateException".
The method is supposed to throw the exception in 500 different
situations.

You are given a Class call Bomb with one method named
blowUp(GPSCoordinates coordinates) that will explode a bomb at the given
position.

Cool. So you write a class called NuclearWeaponContol with the detonate
method that calls Bomb.blowup(..)  and are feeling like a stud.

Boss says... Yo dude... Have you tested that method out to make sure
that it works to the specs?
Mcdaniels says.... Uh.... No... Can I detonate a few bombs to check it
out?
Boss says... No

In walks the high priced spring advocate that says... No problem. I can
write some code to test that method behavior with out actually firing
off a nuke.

Boss fires Mcdaniel and hires the spring advocate.

Spring advocate then extracts an interface called BombInterface from the
class Bomb.
Spring advocate uses spring to inject a TEST implementation of the
BombInterface into future test cases.
The TEST implementation of BombInterface is called BombTest.
Spring advocate then writes a series of junit tests to exercise
NuclearWeaponControl that uses the injected BombTest vs Bomb.

The spring advocate gets hungry and orders a pizza. Mcdaniel delivers
the hot pizza and gets a $10 tip from the high priced spring advocate.
:-)

The spring advocate finishes 500+ junit tests that exercise the 500
exception situations defined in the requirements and banks the check
from the boss.

The boss is happy, the spring advocate is happy, the interface newbie
learns a lessson,
jeff



-----Original Message-----
From: mcdaniel [mailto:521 at ofig.org] 
Sent: Sunday, May 04, 2008 5:51 PM
To: ajug-members at ajug.org
Subject: [ajug-members] design theory

can someone tell me what design to an interface means- what i mean by
this is that i know what it means by definition- because i read about it
often- most oop examples are oak tree extends tree, implements growable,
and then tree extends plantae... etc -then i see lots of  code right up
front as extends jframe, extends awprx.border etc; so...  and this may
be basic'ish, but what's a persons' example of design to the
interface(s); by the way- i am enjoying learning java (i've programmed
for years, but it has all been procedural) and tks for any (theory)input
[i think that i just casted theory-traits onto what was an 'input'
object]

Shivraj Patil wrote:
> answer is Spring oriented.
> Design using Interfaces than Classes,
> it gives us multiple inheritance and polymorphism benefit.
> Enjoy!
>
> On Fri, May 2, 2008 at 9:51 PM, mcdaniel <521 at ofig.org 
> <mailto:521 at ofig.org>> wrote:
>
>     i understand, this was not a question- like, from a test- it's
>     simply me
>     wondering...  -i understand why it looks that way though...
>
>     b
>
>     Chris Fowler wrote:
>     > On Fri, 2008-05-02 at 21:38 -0400, mcdaniel wrote:
>     >
>     >> can anyone please answer my question?
>     >>
>     >
>     > Not good following a mailing list post asking for an answer to
the
>     > question.  You'll not get many answers that way.
>     >
>     > I did a quick google and found some answers
>     >
>     >
>
http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=2
7&t=002061
>
<http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=
27&t=002061>
>     >
>     > http://www.google.com/search?hl=en&q=Extend+Threads+vs
>     <http://www.google.com/search?hl=en&q=Extend+Threads+vs>
>     > +Runnable&btnG=Google+Search
>     >
>     >
>     >
>     >> barclay
>     >>
>     >>  >>>>
>     >>
>     >> 5/1/2008; barclay wrote:
>     >>
>     >>> why would one ever "extend Thread" vs. "implementing
>     Runnable"? -are
>     >>> there speed gains/losses?
>     >>>
>     >>>
>
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>     >
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>
> --
> Regards,
> ShivRaj Patil
> 4685, Apartment # K4
> Atlanta, GA-30338
> Cell: (908) - 720 0285
> ----------------------------------------------------------------------
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