Re: nested generic HashMap problem
Chris Riesbeck wrote:
I don't follow the "don't have a type" part here. The correlation I was
trying to capture was
T get(Demo<T>, long)
using an underlying Map(Demo<T>, Map<long, T>). That seems to me to be
well-defined, just not definable in Java.
Lew wrote:
What do you mean, not definable? That's exactly how you define it,
what you wrote just there, modulo the typos.
class Registry <T>
{
private final Map <Demo <T>, Map <Long, T>> demoMaps =
new HashMap <Demo <T>, Map <Long, T>> ();
...
}
--
Lew
Don't quote sigs.
Chris Riesbeck wrote:
That defines a Map of Maps of one type T. I.e., you can make one
Registry where an instance of Demo<Book> retrieves a Map of type <Long,
Book>, and another Registry where a key of type Demo<Author> retrieves a
Map of type <Long, Author>.
But you can't define a single Registry where a Demo<Book> retrieves a
Map<Long, Book> and Demo<Author> retrieves a Map<Long, Author>.
That isn't what you asked for in the post to which I replied.
--
Lew
don't quote sigs
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