[Java Spec Report] overloading of varargs

I prepare a course on java, so i made some tests and,
i have a case a little bit strange :

class A {
  void m(int... a) {}
  void m(double... b) {}

  void g(Object... o) {}
  void g(String... s) {}
}

new A().m(3) raise an ambiguity and
new A().g(new Object()) don't.

Using the JLS 3, section 15.12.2.4 says the two m are applicables
and section 15.12.2.5 describe th most specific method
using subtyping relationship.
So because int[] and double[] have no subtyping
relationship, a call to m with an int is ambiguous.

I thing in case of varargs, it seems to me more logic if methods
are compared using the component type of the array and not
the array itself (here double vs int and not double[] vs int[])

Rémi Forax




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