Re: Subclassing EnumSet to add an interface?

From:
Lew <lew@nospam.lewscanon.com>
Newsgroups:
comp.lang.java.programmer
Date:
Sat, 12 May 2007 13:35:09 -0400
Message-ID:
<AIadnbWVK5BTZ9jbnZ2dnUVZ_szinZ2d@comcast.com>
Richard Reynolds wrote:

"Eric Smith" <eric@brouhaha.com> wrote in message
news:qhmz0a5po6.fsf@ruckus.brouhaha.com...

Mike Schilling

You're not specifying a constructor, so one is being created for you,
which
looks like

    public Foo()
    {
        super();
    }

Yes, I had tried doing that explicitly as well.

In fact, since EnumSet has no public constructors, it
cannot be subclassed (other than, perhaps, within its package.)

Thanks, I was afraid that might be the case but wasn't sure.

Ugh. I'll have to write my own EnumSet class.

I never cease to be amazed at how often the standard Java
classes do 95% of what I want, but *cannot* be coerced into
letting me implement that last 5%.


Could you write your own class that implements Comparable and just delegates
the EumSet methods to a contained EnumSet class? maybe that's what you meant
anyway?


As Joshua Bloch advised in /Effective Java/, "prefer composition to inheritance."

--
Lew

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