Passing Enum as Type Parameter to method

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Passing Enum as Type Parameter to method

Fri Oct 24, 2008 6:15 pm

If I have a class A with a static method f(), and an object x of
type Class<? extends A> which has been assigned B.class, where B
extends A, how can I use x to call B.f()?



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Re: Passing Enum as Type Parameter to method

Fri Oct 24, 2008 6:16 pm

to get this approach working you have to use polymorphism in the
declaration of M.g:
Code:

public class M {
public static <T extends A> int g (T x) {return T.f ();} public
static <T extends B> int g (T x) {return T.f ();}
}

class A { public static int f() { return 28; } }
class B extends A { public static int f() { return 42; } }

public class testABC {
public static void main(String[] args) {

A alpha= new A ();
B beta = new B ();
M m = new M ();

int retA = m.g (alpha);
int retB = m.g (beta);

System.out.print(retA);
System.out.print(retB);
}
} 


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Java Basics, Java OOP
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