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Re: Java Overloading rules confusion

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On 10/8/2020 10:47 PM, Wayne wrote:
> I have a question on overloading in Java.  [...]
> 
> Shouldn't "m(int,float)" be more specific than "m(double,int)"?

     Had to spend some time studying JLS 15.12.2.5 to find that the
answer is "No."  There's a lot if niggly detail in the JLS, but for
me the easiest explanation comes in the introductory section:

	"The informal intuition is that one method is more specific
	than another if any invocation handled by the first method
	could be passed on to the other one without a compile-time
	error."

Let's try this out with your two versions of m().  Clearly, both
versions could (in isolation) handle m(3,4) or m('3',4) and many
other invocations.  However, m(3,4.0f) would work only with the
(int,float) version, but only (double,int) could handle m(3.0,4).
That is, for each version there is an invocation that it could
accept but would not work with the other.  So (says "informal
intuition") neither is "more specific" than the other, because
each has valid invocations the other could not accept.

     Interesting query.  Thanks!

-- 
esosman@comcast-dot-net.invalid
If he's so rich, why ain't he smart?
One hundred three days to go.

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Thread

Java Overloading rules confusion Wayne <wayne@nospam.invalid> - 2020-10-08 22:47 -0400
  Re: Java Overloading rules confusion Marcel Mueller <news.5.maazl@spamgourmet.org> - 2020-10-09 09:01 +0200
  Re: Java Overloading rules confusion Eric Sosman <esosman@comcast-dot-net.invalid> - 2020-10-09 09:21 -0400
    Re: Java Overloading rules confusion Wayne <wayne@nospam.invalid> - 2020-10-09 22:51 -0400
  Re: Java Overloading rules confusion Arne Vajhøj <arne@vajhoej.dk> - 2020-10-09 09:59 -0400
    Re: Java Overloading rules confusion Wayne <wayne@nospam.invalid> - 2020-10-09 22:51 -0400

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