Article View: borland.public.jbuilder.java.language
Article #8631Re: RTTI at method call time
From: Calvin R. Smith
Date: Mon, 12 Mar 2001 19:34
Date: Mon, 12 Mar 2001 19:34
56 lines
2371 bytes
2371 bytes
Torsten,
Sorry about that I guess I was in a hurry and didn't look to closely at
the example I gave. Here is an example program that demonstrates the error:
package testrtti;
public class Main
{
public Main()
{
}
public void a(Object o)
{
System.out.println("object version called");
}
public void a(Main m)
{
System.out.println("Main version called");
}
public static void main(String[] args)
{
Main main = new Main();
main.a(main); // calls main version
Object o = main;
main.a(o); // calls object version even though the class is really a
main class
main.a((Main)o); // calls main version due to typecast - which should
be implicit
}
}
After running this you can see that the Object version is called even though
the class could be casted to Main and work. Here is the output I get:
Main version called
object version called
Main version called
"Torsten Welches" <torsten.welches@who.cares.netcologne.de> wrote in message
news:3aad162e_2@dnews...
> Calvin,
>
> could you provide a real example?
> In your example it would clearly call b, not c. I assume you meant:
>
> public void c(MyClass mc) {}
>
> public void c(Object o) {}
>
> But even then it would call the MyClass version.
>
> Torsten
>
>
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f74b3,236a87dd0ff35d6d X-Google-Attributes: gidf74b3,public X-Google-ArrivalTime: 2001-03-12 11:46:05 PST Reply-To: "Calvin R. Smith" <calvinrsmith@hotmail.com> From: "Calvin R. Smith" <calvinrsmith@hotmail.com> Newsgroups: borland.public.jbuilder.java.language References: <3aacf50e_2@dnews> <3aad162e_2@dnews> Subject: Re: RTTI at method call time Date: Mon, 12 Mar 2001 12:34:06 -0700 Lines: 58 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 NNTP-Posting-Host: 207.201.104.90 Message-ID: <3aad2512_2@dnews> X-Trace: 12 Mar 2001 11:35:46 -0800, 207.201.104.90 Path: arc1-ca.pugleaf.net!supernews.google.com!sn-xit-03!supernews.com!cyclone2.usenetserver.com!news-out.usenetserver.com!feed2.onemain.com!feed1.onemain.com!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!colt.net!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!bornews.borland.com!dnews!207.201.104.90