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Groups > comp.lang.java.programmer > #17978

Re: multiple inheritance

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On 8/12/2012 11:19 PM, Lew wrote:
> Arne Vajhøj wrote:
>> Roedy Green wrote:
>>> 1. It has interfaces which gives much of the ability at lighter
>>> weight..
>>
>> Only for a very limited type of types (those with no implementation
>> at all).
>
> That is true, but "very limited" might be misconstrued as "not very
> useful". That Java limits multiple inheritance to interfaces is a design
> decision of the language, and confers advantages.

Indeed.

Implementation inheritance is not in fashion in Java, so interfaces
is the majority of cases.

A classic text:

http://www.artima.com/intv/gosling34.html


> There are vanishingly few cases where one cannot mix in implementation
> through a combination of composition and single inheritance of
> implementation ('class' parent types) to accomplish with equal facility
> what multiple implementation inheritance would. Avoiding the sorts of
> downsides mentioned upthread is the motivation.

There are some solutions to those problems. But Java was designed to
be simple, so we got what we got.

Arne

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Thread

multiple inheritance bob smith <bob@coolfone.comze.com> - 2012-08-01 19:28 -0700
  Re: multiple inheritance markspace <-@.> - 2012-08-01 20:07 -0700
    Re: multiple inheritance Gene Wirchenko <genew@ocis.net> - 2012-08-01 21:07 -0700
  Re: multiple inheritance Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-01 23:12 -0400
  Re: multiple inheritance Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-08-01 23:41 -0400
    Re: multiple inheritance Lew <lewbloch@gmail.com> - 2012-08-02 01:05 -0700
    Re: multiple inheritance Arne Vajhøj <arne@vajhoej.dk> - 2012-08-12 23:15 -0400
  Re: multiple inheritance Roedy Green <see_website@mindprod.com.invalid> - 2012-08-02 01:10 -0700
    Re: multiple inheritance Arne Vajhøj <arne@vajhoej.dk> - 2012-08-12 23:08 -0400
      Re: multiple inheritance Lew <noone@lewscanon.com> - 2012-08-12 20:19 -0700
        Re: multiple inheritance Arne Vajhøj <arne@vajhoej.dk> - 2012-08-17 22:33 -0400
      Re: multiple inheritance Leif Roar Moldskred <leifm@dimnakorr.com> - 2012-08-13 05:55 -0500
        Re: multiple inheritance markspace <-@.> - 2012-08-13 07:58 -0700
        Re: multiple inheritance Arne Vajhøj <arne@vajhoej.dk> - 2012-08-17 22:38 -0400
  Re: multiple inheritance Jan Burse <janburse@fastmail.fm> - 2012-08-02 10:12 +0200

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