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From: markspace <markspace@nospam.nospam>
Newsgroups: comp.lang.java.programmer
Subject: Re: Queue and Map interface
Date: Fri, 13 Jun 2014 16:52:46 -0700
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On 6/13/2014 2:32 PM, Eric Sosman wrote:
>      For even more "favoritism," you could have the outer class
> implement neither Map nor Queue, and delegate both those interfaces
> to inner classes.
>

Or just have two methods to call on some generic object which return a 
"view" of that object as either a Map or a Queue.

interface MyCollection {

   Map asMap();
   Queue asQueue();

}