Calling a method

Here's another thing I'm trying to do that I hope someone can help with.
I'd like to call a method on an instance of a class using a string as
the method name. Something like anInstance.perform("getName"), which
would call the method getName() on the instance and return the value
from that.

Any ideas on that?

On Thu, 21 Apr 2005 12:33:43 -0400, cdx <jm1@dicehome.com> wrote:

>Here's another thing I'm trying to do that I hope someone can help with.
>  I'd like to call a method on an instance of a class using a string as
>the method name. Something like anInstance.perform("getName"), which
>would call the method getName() on the instance and return the value
>from that.

The following is the same as calling:
String testString = "Testing 123";
int result = testString.indexOf("123");


String testString = "Testing 123";
Class clazz = String.class;
Class[] parameterTypes = {String.class};

Method method = clazz.getDeclaredMethod("indexOf",
parameterTypes);
Object[] parameters = {"123"};
Object result = method.invoke(testString, parameters);

System.out.println(result.toString()); // 8

--
now with more cowbell

In article <Q8adnTn68-5TSPrfRVn-oQ@comcast.com>, jm1@dicehome.com enlightene
d
us with...
> Here's another thing I'm trying to do that I hope someone can help with.
>   I'd like to call a method on an instance of a class using a string as
> the method name. Something like anInstance.perform("getName"), which
> would call the method getName() on the instance and return the value
> from that.
>
> Any ideas on that?

You have to use reflection to do that sort of thing. There's nothing as
simple as just one line of code for it (like javascript and asp have), no.
Here are a couple options.
http://mindprod.com/jgloss/eval.html

--
--
~kaeli~
If a book about failures doesn't sell, is it a success?
http://www.ipwebdesign.net/wildAtHeart
http://www.ipwebdesign.net/kaelisSpace