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|---|---|
| From | Andreas Leitgeb <avl@logic.at> |
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: class parameter with generic type on a factory |
| Date | Sun, 22 Jan 2017 11:02:18 -0000 (UTC) |
| Organization | A noiseless patient Spider |
| Lines | 21 |
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Arne Vajhøj <arne@vajhoej.dk> wrote:
> Some experimentation ended up with this:
> public static interface MyInterface<T> ...
> public static class MyClass<T> implements MyInterface<T> ...
> public static class MyFactory<T> {
> public MyFactory(Class<? extends MyClass<T>> clz) ...
> }
Indeed, the factory method can specify a type-parameterized class for
its argument, which removes the "dirty" unchecked cast from inside the
factory, but there is no way to completely get rid of the unchcked cast.
> public static void main(String[] args) throws [...] {
> @SuppressWarnings("unchecked")
> MyFactory<String> mf = new MyFactory<String>(
> (Class<? extends MyClass<String>>)MyClass.class
> );
Actually, I think leaving the cast inside the factory makes for cleaner
code.
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class parameter with generic type on a factory Philipp Kraus <philipp.kraus.flashpixx@gmail.com> - 2017-01-21 08:19 -0800
Re: class parameter with generic type on a factory Andreas Leitgeb <avl@logic.at> - 2017-01-21 19:33 +0000
Re: class parameter with generic type on a factory Philipp Kraus <philipp.kraus.flashpixx@gmail.com> - 2017-01-21 11:51 -0800
Re: class parameter with generic type on a factory Andreas Leitgeb <avl@logic.at> - 2017-01-21 20:11 +0000
Re: class parameter with generic type on a factory Arne Vajhøj <arne@vajhoej.dk> - 2017-01-21 23:04 -0500
Re: class parameter with generic type on a factory Andreas Leitgeb <avl@logic.at> - 2017-01-22 11:02 +0000
Re: class parameter with generic type on a factory Arne Vajhøj <arne@vajhoej.dk> - 2017-01-22 14:00 -0500
Re: class parameter with generic type on a factory Marcel Mueller <news.5.maazl@spamgourmet.org> - 2017-01-22 09:14 +0100
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