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  Generics FAQ  (Read 1009 times)
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Offline swpalmer

JGO Coder


Exp: 12 years


Where's the Kaboom?


« Posted 2006-02-22 19:34:41 »

I think I'm not alone when I count myself amoung the generics newbies... so when a co-worker found this Generics FAQ I thought I would pass it along...

http://www.angelikalanger.com/GenericsFAQ/JavaGenericsFAQ.html

When you get compiler errors like: "capture of ? extends T does not apply to...blah blah" and you just want someone to shoot you, first try the above FAQ and you might save yourself a painful bullet wound.

Offline Riven
Administrator

« JGO Overlord »


Medals: 1243
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #1 - Posted 2006-02-22 21:07:33 »

In Eclipse i run into stuff like:

capture of ? extends T does not apply to capture of ? extends T

While they're equal...



I can't help but wonder why the standard rules in Java are not copied in the handling of Generics...
1  
Thing thing = ...; // can be a Thing, or a subclass of Thing, easy as that

but with generics you go
1  
2  
3  
List<? extends Thing> things = ...;
List<Thing> things = ...;
// and what-not



unbound, upperbound, lowerbound wildcards, etc...  This is just funny...
Quote
Which methods that use the type parameter as upper wildcard bound in a parameterized argument or return type are accessible in a wildcard instantiation?
Is that a Frequently asked question? really? I can hardly pronounce it Smiley


Oooh, i'm hijacking a thread! Grin

It's a good FAQ, but I aint gonna read it Smiley

Hi, appreciate more people! Σ ♥ = ¾
Learn how to award medals... and work your way up the social rankings!
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