Article View: borland.public.jbuilder.java.language
Article #614Re: Reflection on invoking methods
From: Shankar Unni
Date: Tue, 29 Mar 2005 19:38
Date: Tue, 29 Mar 2005 19:38
25 lines
1919 bytes
1919 bytes
Aven wrote:
> 1. How to deal with primitive argument types ?
You make an object out of it.
> for example, if the method is foo(int a, int b);
> the arguments are passed as new Object[]{10,20},
> however, the method was not found because of autoboxing.
If the method was *defined* as taking an "int" (as above), then
reflection will show its parameter type as == "int.class". (There are
nine predefined Class objects to represent the eight primitive types and
void).
To pass an actual parameter for these types, just pass in an "Integer"
or a "Double" or whatever the equivalent Object type is.
> 2. How to search varargs methods smartly?
Method.isVarArgs().
The last formal parameter (according to the reflection API) for varargs
methods will be an Object[] array - you pass all the variadic arguments
in that array.
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X-Google-Thread: f74b3,837487ca0499b687 X-Google-Attributes: gidf74b3,public X-Google-Language: ENGLISH,ASCII-7-bit Date: Tue, 29 Mar 2005 11:38:03 -0800 From: Shankar Unni <shankarunni@netscape.net> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.6) Gecko/20050317 Thunderbird/1.0.2 Mnenhy/0.7 X-Accept-Language: en-us, en MIME-Version: 1.0 Newsgroups: borland.public.jbuilder.java.language Subject: Re: Reflection on invoking methods References: <4248c14d$1@newsgroups.borland.com> In-Reply-To: <4248c14d$1@newsgroups.borland.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit NNTP-Posting-Host: 68.120.146.125 Message-ID: <4249ae9a$1@newsgroups.borland.com> X-Trace: newsgroups.borland.com 1112125082 68.120.146.125 (29 Mar 2005 11:38:02 -0800) Lines: 25 Path: arc1-ca.pugleaf.net!g2news1.google.com!news1.google.com!newsread.com!news-xfer.newsread.com!nntp.abs.net!news-FFM2.ecrc.net!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!newsgroups.borland.com!not-for-mail