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Java Generics - Casting to "null's class"

 
Bob Hunt
Greenhorn
Posts: 5
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Hi,

I came across an interesting situation.
I've got a method that gets a class as a parameter so the caller method doesn't have to cast, because the called method will have the same return type as the class parameter's type. Here is a simplified version of that.



When I pass I get 10. When I pass "null" I still get 10. When I write I get a compiler error, of course.

My question: What happens when I pass null as a class and the JVM try to cast 10 to null in runtime?
 
Greg Charles
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I don't really know how Java handles null in that case, but I do know it's not at run time. In Java, both casting and generics are seen by the compiler only. They have no effect on the running program.
 
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