[ajug-members] design theory

521 521 at ofig.org
Mon May 5 12:06:36 EDT 2008 

i suspect it says that 'interfaces'- 'using traditional java oo concepts'- only provide method names and if you plan/program to these same method 'names' then no-one is affected by changes made to the classes that the interface targets (interacts with - is bound to)

all a consumer needs to do is plug in the tv set, computer, or microwave; a home's wiring is designed to the interface/wall-socket; same as plumbing, i guess...

barclay

On Mon, 5 May 2008 08:53:01 -0400, Gary Marshall wrote
> This is great, however, I would pay Mcdaniel $10 to explain the same concept to me using traditional Java OO concepts, not using Spring or Junit. 
> g
> 
>   
> On 5/5/08, 521 <521 at ofig.org> wrote:

> 
> cool-beans jeff- tks  :) 
> On Sun, 4 May 2008 20:30:31 -0500, Bentley, Jeff wrote 
> > 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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> > > 
> > > -- 
> > > Regards, 
> > > ShivRaj Patil 
> > > 4685, Apartment # K4 
> > > Atlanta, GA-30338 
> > > Cell: (908) - 720 0285 
> > > ---------------------------------------------------------------------- 
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