Re: Class<T> question

Thanks, it worked to use Class<?> instead of just Class.  

In the example you cite, couldn't you have declared

   Map<Object, String> map = new HashMap<Object, String>();

Instead of 

   Map<? extends Object, String> map = new HashMap<Object, String>();


- Mitch
 

-----Original Message-----
From: Discussion of advanced Java topics.
[mailto:[email protected]] On Behalf Of Attila Szegedi
Sent: Wednesday, December 05, 2007 10:49 AM
To: [email protected]
Subject: Re: [ADVANCED-JAVA] Class<T> question

In my recent wrestling with "genericizing" a codebase that was
originally pre-Java 5, I'd suggest you try replacing "Class" with
"Class<?>".

Alternatively, disable compiler warning for generics. No, seriously.
Honestly, my feeling is that programming with generics causes more
noise in source code than it eliminates. Yeah, it eliminates casts,
but previously I would write:

Map map = new HashMap();
...
String x = (String)map.get(blah);

Now I write monstrosities such as:

Map<? extends Object, String> map = new HashMap<Object, String>();
...
String x = map.get(blah);

So, I need to write one cast less, and four type specifiers more. Net
loss in code conciseness.
I guess I'm just getting old and resistant to change.

Attila.

On 2007.12.05., at 14:12, Gart, Mitchell wrote:

> I am trying to get rid of some compiler warnings in our code.  We
> have a
> method:
>
>   public static Logger getLogger(Class c) {
>      return new Log4jLogger(c.getName());
>   }
>
> and the compiler produces this warning:
>
>   Class is a raw type. References to generic type Class<T> should be
> parameterized
>
> It is because Class is a generic type but I don't quite understand
> how I
> would change the declaration of the method, and the calls to the
> method,
> to make it parameterized and get rid of the warning.  Can somebody
> explain this a little bit?  Thanks.
>
> - Mitch Gart

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