Anonymous user
Talk:Formal power series: Difference between revisions
→Java and generics: Java's generics aren't helpful here...
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It was my understanding that generics had been added to Java recently, yet the Java example indicates that they're not available. A generic implementation would be far better than using the "swap out the type for the one you want" implementation it currently uses. --[[User:Short Circuit|Short Circuit]] 17:31, 17 May 2009 (UTC)
: Alas, <tt>java.lang.Number</tt> is not a very useful base-class in this regard, nor are its standard subclasses any better. In particular, there's no built in methods for performing arithmetic; those operations are only defined on the atomic numeric types, which can't participate in the generic type system. This means that the example would have to build its own type framework, and suddenly that's looking like real work and not elegant examples. (FWIW, the reason why the atomic types don't participate in the generics system is that they are treated specially by the JVM spec; addition on integers is completely different to addition on doubles. This would have forced recompilation for handling generic atomics, which was rejected as being silly and expensive. By contrast, swapping one object type for another is pretty straight-forward.) —[[User:Dkf|Dkf]] 21:40, 22 May 2009 (UTC)
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