🚀 go-pugleaf

Thank you for your notes!  I have a bit to decide for our code with this.
Thanks again.



"Owen" <owen@begonefoulmachine.kennulz.demon.co.uk> wrote in message
news:3ccf3edb_1@dnews...
>
> "PeterH" <!REMOVEBeforeSending!peter@pchenry.com> wrote in message
> news:3ccebd9c_2@dnews...
> > What is the proper or suggested way to compare if one class is of
another
> > type/class?
> >
> > Should the .getClass() be used to compare it with the .class?  Or should
> the
> > instanceof keyword be used?
> >
> A straight comparison of getClass() will work only of you're inetersted in
> comparing whether two objects have exactly the same concrete (i.e.
> implmentation) class (and were loaded by the same classloader? This rings
a
> bell...).
>
> a instanceof b will return true if the object under inspection (a) can be
> cast to the class in question (b) without a ClassCastException ocurring,
so
> will work with if a's class derives from b.
>
> You could also use Class.isInstance() to test whether a given object is of
a
> class whose type is not necessarily known at compile time, which is useful
> for dynamic class loading situations.
>
> Be aware that none of these things are paricularly speedy, and that by and
> large avoiding this sort of class comparison in favour of polymorphism is
> preferable where possible.
>
> hth
> Owen
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