Design Patterns discussion

[Jesús Alonso <kenchoweb AT hotmail.com>]

I can't think in which manner Builder and Template Method patterns can be 
related to each other. The Builder gives a solution to a build-by-parts 
problem, while the Template Method is useful when you want to define a 
concrete algorithm skeleton, with slight differences in some steps of the 
algorithm. Maybe you wanted to say Factory Method? If so, then it just gives 
a solution to a problem when a class is responsible of creating many 
different objects depending on a certain discriminator.

Hope that helps.

> I like your differentiation between State and Strategy.
> I do also have a confusion that I tend to think Builder and TemplateMethod 
> patterns mean the same though they fall in creational and behavioral 
> pattern respectively.
> Both encapsulate a process of doing/creating.
> Deena
>
> -------------- Original message --------------
>
> > >I'm wondering if you can give me some additional details as to how 
> these
> > >are different? Their applicability, purpose and structure seem nearly
> > >identical: make the behavior of the context class change dynamically as
> > >the state/strategy changes. Both patterns even mentions how they can be
> > >tied into the flyweight pattern. The only difference I can readily see
> > >is that the state pattern mentions transitions while the strategy does
> > >not. Am I missing something?
> > >
> > >
> > >
> > >Thank you for your time,
> > >
> > >-James
> >
> > I'm not sure, as I haven't used Strategy pattern with the exception of
> > academic purposes. Anyways, the difference I see between them is that 
> the
> > State pattern acts as a finite state machine, so the transitions between
> > them are inside of them, hiding that responsibility away from the 
> client,
> > while the Strategy pattern requires the client to transition between
> > strategies.
> >
> >
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