Re: (Class>) casting troubles

[Sebastiaan van Erk]

Martin Funk wrote:

Foo<? extends Bar<?>> rawbar = new Foo<RawBar>(); // DOES NOT WORK - THIS IS CAUSING ONE HALF OF ALL OUR HEADACHES

Btw, this does work (like you expect):
   Foo<? extends Bar<?>> rawbar2 = new Foo<SubBar<?>>();

maybe some more wisdom can be found here:

http://www.angelikalanger.com/GenericsFAQ/FAQSections/TechnicalDetails.html#FAQ209 In her words it would mean 'raw types are not part of the type family denoted by the wildcard parametrized type Bar<?>' But I'm still puzzled, since taking that FAQ it doesn't explain why in the case of the generic method

public <T extends Component<?>> void dol(Class<T> clazz)

the raw types are all of a sudden member of that family

Nor does it explain why assignment:

  Bar<?> bar = new RawBar();

works, without errors or warnings...

the faq comes up with this:

http://www.angelikalanger.com/GenericsFAQ/FAQSections/ParameterizedTypes.html#FAQ106

and this:

http://www.angelikalanger.com/GenericsFAQ/FAQSections/ParameterizedTypes.html#FAQ310

Regards,
Sebastiaan

I find the argumentation rather mind-bending. And I still wonder how you can rationalize away that Foo.class returns a type that generates warnings if you want to use it!

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