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  Generics FAQ  (Read 859 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...

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
« League of Dukes »

« JGO Overlord »

Medals: 1049
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...
Thing thing = ...; // can be a Thing, or a subclass of Thing, easy as that

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

unbound, upperbound, lowerbound wildcards, etc...  This is just funny...
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

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