Re: Support for interface default methods when selecting an overloaded method

Thanks for trying the RC.

Had it worked, it would have been luck. It has crossed my mind that it 
ought to be a feature, but we haven't attempted to add it. I haven't 
even thought about how default is implemented in Java.

You could raise it as a bug (feature request) on bugs.jython.org. You 
could even submit a patch. (The logic of method resolution is fairly 
complicated.) There will, I think, be a 2.7.3, and if there isn't, it 
will be because we're working on a 3.x. One of them should have this if 
it can be implemented at all.

Jeff Allen

On 05/03/2020 06:30, Nicolas Falliere wrote:
> Hello Jython Dev Team,
>
> Per 
> https://www.jython.org/jython-old-sites/archive/221/archive/22/userguide.html#overloaded-java-method-signatures: 
> /"Java methods are allowed to be overloaded for different signatures 
> (types and number of arguments). When different versions of the method 
> differ in the number of arguments that they expect, the appropriate 
> method can be easily determined from the number of arguments passed to 
> the method."/
>
> With Jyhon 2.7 (2.7.1, and the current RC of 2.7.2 as well), this 
> works fine for regular class methods, eg:
> class A {
>   void f(int a) {
>     return a + 1;
>   }
>   void f(int a, int b) {
>     return a+b;
>   }
> }
>
> in Jython:
> A().f(4)     # will select the proper overload
> A().f(1, 2)  # will select the proper overload
>
> However, for interfaces:
> interface I {
>   default void f(int a) {
>     return f(a, 1);
>   }
>   void f(int a, int b);
> }
> class A implements I {
>   void f(int a, int b) {
>     return a+b;
>   }
> }
>
> in Jython:
> x = someMethodReturningAnObjectImplementingI()
> x.f(4)     # fail, complains that method should receive 2 args
>
> So it looks like default methods, a language addition of Java 8, may 
> not be seen by the Jython interpreter. Is that the case, or am I doing 
> something wrong? In the former case, any chance to support that in a 
> coming release?
>
> Thank you & Best regards,
> --
> Nicolas Falliere ([email protected] <mailto:[email protected]>)
> JEB Decompiler, Founder and Architect
> PNF Software <https://www.pnfsoftware.com/>| Follow us on Twitter 
> <https://twitter.com/jebdec> | Join us on Slack 
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>
>
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