Book excerpt about Collections

http://java.sun.com/developer/Books/javaprogramming/javaobjects/ch06final.pdf
Nowhere in this free chapter does the author advise to declare Collections by specifying the least specialized type possible
it's always something like :
ArrayList arrayList = new ArrayList();
// using Collection methods only, like "add()"...By doing so, aren't we losing one of the most interesting aspect of Collections : designing by contract and being able to swap implementations as the needs change ?
Do you think this is irrelevant in a chapter about collections but belongs to a pure OO chapter ?
Just wondering...

I've only skipped the chapter, so I might miss anything. But I'll give you my two Euro-Cents nevertheless:
- I think it should be mentioned in the chapter, even 'though that chapter obviously is not about that specific concept. More importantly the chapter should really use that paradigm throughout it's example code. I think in this case giving correct examples is much better than repeating the message again and again.
- The chapter does mention using a simple wrapper about the list to hide away the use of the concrete list implementation in favour of a more business-orientet interface (Transcript+TranscriptEntry vs. ArrayList<TranscriptEntry>). IMO that is another approach to the same "problem".

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