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From: Jim Janney <jjanney@shell.xmission.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: "Program to an interface" - When to break a design pattern
Date: Thu, 05 May 2011 16:00:54 -0600
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Lew <noone@lewscanon.com> writes:

> Jim Janney wrote:
>> The justification is not in the code shown, but in the accompanying
>> remark "I need the map to retain the insertion order."  There's no
>> interface in the JRE that promises this,
>
> other than
> <http://download.oracle.com/javase/6/docs/api/java/util/SortedMap.html>
> you mean.
>
>> and only one class that provides it, which makes encapsulation, shall we say, difficult.
>
> Oh, really?
>
> Two are listed in the API docs for that "nonexistent" interface, and
> neither one is 'LinkedHashMap'.
>
> Knowing the collections API is a prerequisite for effective Java programming.

The original poster said very plainly, "I need the map to retain the
insertion order."  A SortedMap does not do this.

-- 
Jim Janney