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Re: the benefits of immutability
Vadim Nasardinov <email@example.com> writes:
> On 09 Aug 2003 14:20:45 -0400 (Message-ID:
> <firstname.lastname@example.org>), Perry E. Metzger wrote:
> > I recently wrote a (partial) Scheme interpreter in Java to learn
> > Java better, but part of what I learned what how limiting Java
> > is. Not having function pointers sucks big time, as does not being
> > able to subclass a class like String
> The finality of the String class is a consequence of its immutability.
That's just plain incorrect. Obvious evidence is that there is also a
mutable string type and it is also final -- i.e. cannot be
subclassed. Just because the strings themselves are immutable doesn't
mean that you can't safely add extra methods etc. to a subclass. The
two are unconnected.
> With the availability of StringBuffer as a mutable companion of
> String, I honestly can't remember when was the last time I wished
> String were not final.
StringBuffer is also final. You can't subclass it, either.
I think you miss the point.