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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()?




Author:
Proficient
User avatar Posts: 280
Have thanks: 1 time

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

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.(alpha);
int retB = m.(beta);

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


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Author:
Proficient
User avatar Posts: 228
Have thanks: 0 time
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Topic Tags

Java OOP, Java Basics
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