RE: [Java Spec Report] overloading of varargs

Section 15.12.2.5 has explicit rules for dealing with variable arity method=
s. It seems to describe exactly the behaviour you expect.=20

It refers to the types of the parameters as T1, ..., Tn-1, Tn[] && U1, ...,=
 Uk-1, Uk[]

This implies that for the last parameter for both methods the comparisons a=
re done against the element type of the array, not the array type.

It looks like an implementation bug to me.

Tim

> -----Original Message-----
> From: Remi Forax [mailto:[email protected]]
> Sent: Thursday, July 29, 2004 2:29 AM
> To: [email protected]
> Subject: [Java Spec Report] overloading of varargs
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> I prepare a course on java, so i made some tests and,
> i have a case a little bit strange :
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> class A {
>   void m(int... a) {}
>   void m(double... b) {}
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>   void g(Object... o) {}
>   void g(String... s) {}
> }
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> new A().m(3) raise an ambiguity and
> new A().g(new Object()) don't.
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> 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.
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> 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[])
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> R=E9mi Forax
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