Re: [Jython-dev] casting

[Brian Z. <bri...@ya...>]

That's exactly like the example I gave.

You get the Object back (you know it's actually a String, right?), then you
can just pass the instance directly to the xml-rpc method expecting a
String. No cast needed. Because you call the method from Jython, there won't
be any compilation error. Runtime, if it's really a String, no problem; if
not, it will raise AttributeError for any String method get invoked.

-Brian

----- Original Message -----
From: "Roman Milner" <ro...@sp...>
To: "Brian Zhou" <bri...@ya...>
Cc: <jyt...@li...>
Sent: Friday, June 29, 2001 5:21 PM
Subject: Re: [Jython-dev] casting


> >>>>> "BZ" == Brian Zhou <bri...@ya...> writes:
>
>     BZ> In dynamic languages like Python/Smalltalk/Scheme, you usually
>     BZ> don't need cast. Because "the methods a particular instance
>     BZ> can perform" becomes the type of the instance, it's not as
>     BZ> important which class that instance actually belongs. At
>     BZ> instantiation time, "all the methods the instance can perform"
>     BZ> is determined. At runtime, you either can call the method or
>     BZ> you get an AttributeError.
>
> What if you need to pass an object to a java method that requires it
> to be cast to a different java type?
>
> What if one java method gives me an Object back, but it is actually a
> String. I have another java method that requires a String argument. Is
> there a way to do that cast in jython?
>
> I ran in to this when trying to use the Java xml-rpc library from
> jython.
>
> ^Roman
>