jls overridding description
konstantin barzilovich
konstantin.barzilovich at oracle.com
Thu May 21 13:20:56 UTC 2015
Hello,
It was interesting example. I didn't think about this.
Now I see that both conditions are required.
Thanks for clarification,
Konstantin.
On 20.05.2015 18:50, Dan Smith wrote:
>> On May 20, 2015, at 7:24 AM, konstantin barzilovich <konstantin.barzilovich at oracle.com> wrote:
>>
>> Hello,
>>
>> Thank you for the answer.
>> As I understand, you said that jls-8.4.8.1-100-B can be false while jls-8.4.8.1-100-C is true.
> Right: you can have mC with a subsignature of mA, but still inherit mA.
>
>> But is it possible that jls-8.4.8.1-100-C is false while jls-8.4.8.1-100-B is true? (the opposite situation)
> Can you not inherit mA, but choose an mC that does not have a subsignature of mA? Sure. Note that the selection of mA and mC is pretty unrestricted -- this subsignature clause it what limits the set of methods to things you'd intuitively expect to consider.
>
> So, for example:
>
> public class A {
> public void foo() {} // mA
> }
>
> public class B {
> public void bar(int arg) {} // mC
> public void foo() {}
> }
>
> Is A a superclass of C? Yep. Does C inherit mA? Nope -- the declaration of another 'foo' method prevents it. Is mA public? Yep.
>
> But mC definitely does not override mA.
>
> —Dan
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