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Re: When to use dynamic binding over dynamic dispatch?

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On 5/8/2016 4:44 PM, Eric Sosman wrote:
> On 5/8/2016 10:37 AM, Arne Vajhøj wrote:
>> On 5/8/2016 8:57 AM, Eric Sosman wrote:
>>> On 5/8/2016 8:23 AM, Arne Vajhøj wrote:
>>>> then how can it be?
>>>
>>>     class Super {
>>>         public void method() {}
>>>     }
>>>
>>>     class Sub extends Super {
>>>         public final void method() {}
>>>     }
>>>
>>>     ...
>>>
>>>     Super obj = new Sub();
>>>     obj.method();
>>
>> As a starting point I would not call Sub.method
>> a virtual method due to above definition.
>
>     Let's try another example, if you dislike my first one:
>
>     class Worker implements Runnable {
>         @Override
>         public final void run() {}
>     }
>
> The Worker#run method is quite obviously final, and not
> overridable.  Do you maintain that it isn't virtual?  If
> we follow the above with
>
>     new Thread(new Worker()).start();
>
> ... should the thread's invocation of Worker#run use something
> other than virtual invocation?

It certainly need to use virtual invocation, because it is
calling Runnable run which is virtual.

But does that make Worker run virtual when it is final?

Seems to be the Java way. But not natural to me.

Arne

PS: I don't think the above will use virtual invocation - it will
     use interface invocation as Runnable is an interface. But
     I don't think that is particular relevant.

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When to use dynamic binding over dynamic dispatch? cdalten@gmail.com - 2016-05-02 18:08 -0700
  Re: When to use dynamic binding over dynamic dispatch? Sebastian <news@seyweiler.dyndns.org> - 2016-05-03 20:47 +0200
    Re: When to use dynamic binding over dynamic dispatch? Lew <lewbloch@gmail.com> - 2016-05-03 12:14 -0700
  Re: When to use dynamic binding over dynamic dispatch? Arne Vajhøj <arne@vajhoej.dk> - 2016-05-03 21:23 -0400
    Re: When to use dynamic binding over dynamic dispatch? Martin Gregorie <martin@address-in-sig.invalid> - 2016-05-04 10:48 +0000
    Re: When to use dynamic binding over dynamic dispatch? Robert Klemme <shortcutter@googlemail.com> - 2016-05-08 12:24 +0200
      Re: When to use dynamic binding over dynamic dispatch? Arne Vajhøj <arne@vajhoej.dk> - 2016-05-08 08:23 -0400
        Re: When to use dynamic binding over dynamic dispatch? Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-05-08 08:57 -0400
          Re: When to use dynamic binding over dynamic dispatch? Arne Vajhøj <arne@vajhoej.dk> - 2016-05-08 10:37 -0400
            Re: When to use dynamic binding over dynamic dispatch? Robert Klemme <shortcutter@googlemail.com> - 2016-05-08 22:30 +0200
              Re: When to use dynamic binding over dynamic dispatch? Arne Vajhøj <arne@vajhoej.dk> - 2016-05-08 23:08 -0400
                Re: When to use dynamic binding over dynamic dispatch? Robert Klemme <shortcutter@googlemail.com> - 2016-05-09 08:16 +0200
            Re: When to use dynamic binding over dynamic dispatch? Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-05-08 16:44 -0400
              Re: When to use dynamic binding over dynamic dispatch? Arne Vajhøj <arne@vajhoej.dk> - 2016-05-08 23:16 -0400
                Re: When to use dynamic binding over dynamic dispatch? Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-05-09 00:39 -0400

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