Re: final methods and classes
Rzeznik wrote:
On 12 Paz, 07:02, "Mike Schilling" <mscottschill...@hotmail.com>
wrote:
markspace wrote:
Mike Schilling wrote:
Lionel van den Berg wrote:
Hi all,
Just wondering what arguments there are out there for making
methods
and classes final when they are not expected to be overridden/
extended? Typically I would make them final, but when I'm doing
code
reviews I don't raise this as an issue because I see it is
relatively
trivial.
Some classes have not been designed to be extensible (either as a
deliberate choice or because the time wasn't taken to make
extensibility work correctly.)
This is the one I would emphasize. "Either design for inheritance
or
prevent it." Effective Java, I believe, by Joshua Bloch.
There's a rule of thumb I was taught long ago that one shouldn't
derive one concrete class from another. I've found it to be
excellent
advice. I can't explain particularly well why doing so is a bad
idea
in general, but whenever I've been tempted to break the rule, I've
found that creating an abstract superclass (or a hierarchy of such
superclasses) from which all concrete classes are derived has
solved
problems the concrete-derived-from-concrete design created. I don't
think it's far wrong to say:
Declare all concrete classes as final.
... if you are ominous
If you are ominous then this idea is great. I'd bet you are not.
I can be pretty threatening at times. Or do you mean "omniscient"?
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