[jdjlist] Re: interface for only 1 class

[James Stauffer]

Title: interface for only 1 class

How do you balance that will all of the times that an interface isn't necessary?  Another aspect is that an interface usually makes it more complex.  If there is no foreseeable need for an interface when should you use an interface and when shouldn't you?

 

James Stauffer

-----Original Message-----
From: Greg Nudelman [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, December 03, 2002 12:28 PM
To: JDJList
Subject: [jdjlist] Re: interface for only 1 class

It depends.  Let's say you only expect to use Oracle DB in the foreseeble future.  So you write your driver loading, and persistance all over the place, and create it only for the Oracle.  But in 12 months, your business folks decide to try and sell the system to some customer, who just got to have SQL Server.  If you wrote persistence as an interface, it is a snap, otherwise, some work and re-testing af the whole thing may be involved.

 

Sounds funny, but this is a real-life example.

 

Greg

-----Original Message-----
From: James Stauffer [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, December 03, 2002 7:54 AM
To: JDJList
Subject: [jdjlist] interface for only 1 class

Is it good to have an interface if there will only be one class to implement it in the foreseeable future? Does it add unnecessary complexity? It usually isn't much more complex but does that extra complexity add extra value? Agile programming seems to say "don't build it because you won't need it." What do you think?

James Stauffer

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