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Groups > comp.lang.java.programmer > #17826

Re: multiple inheritance

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  To: Arne Vajhøj
From: Leif Roar Moldskred <leifm@dimnakorr.com>

Arne Vajh-,j <arne@vajhoej.dk> wrote:
> On 8/2/2012 4:10 AM, 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).

At times, I've wished that Java had automatic delegation (composition) in 
addition to inheritance and interface implementation, where the compiler 
automatically adds the public methods and fields from delegated objects, except 
when there's a conflict of names. Something like this, maybe:


public class ClassAlfa {
  public void alfaMethod( ) { ... }
  public void sharedMethod( ) { ... }
  public void anotherSharedMethod( ) { ... }
}

public class ClassBeta {
  public void betaMethod( ) { ... }
  public void sharedMethod( ) { ... }
  public void anotherSharedMethod( ) { ... }
}


public class Delegator {
  private delegate ClassAlfa ALFA;
  private delegate ClassBeta BETA;

  public void sharedMethod( ) {
    ALFA.sharedMethod( );
  }

  public void anotherSharedMethod( ) {
    ALFA.sharedMethod( );
    BETA.sharedMethod( );
  }
}

public class Example {
  public static void main( String[] args ) {
    private Delegator delegator;

    delegator.alfaMethod( );
    delegator.betaMethod( );
    delegator.sharedMethod( );
    delegator.anotherSharedMethod( );
  }
}

--
Leif Roar Moldskred

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Thread

multiple inheritance "bob smith" <bob.smith@1:261/38.remove-s5y-this> - 2012-08-02 19:11 +0000
  Re: multiple inheritance "markspace" <markspace@1:261/38.remove-s5y-this> - 2012-08-02 19:11 +0000
    Re: multiple inheritance "Gene Wirchenko" <gene.wirchenko@1:261/38.remove-s5y-this> - 2012-08-02 19:12 +0000
  Re: multiple inheritance "Eric Sosman" <eric.sosman@1:261/38.remove-s5y-this> - 2012-08-02 19:11 +0000
  Re: multiple inheritance "Joshua Cranmer" <joshua.cranmer@1:261/38.remove-s5y-this> - 2012-08-02 19:12 +0000
    Re: multiple inheritance "Lew" <lew@1:261/38.remove-s5y-this> - 2012-08-02 19:12 +0000
    Re: multiple inheritance "Arne Vajhøj" <������
høj@1:261/38.remove-nlb-this> - 2012-08-13 18:36 +0000
  Re: multiple inheritance "Roedy Green" <roedy.green@1:261/38.remove-s5y-this> - 2012-08-02 19:12 +0000
    Re: multiple inheritance "Arne Vajhøj" <arne.vajhøj@1:261/38.remove-nlb-this> - 2012-08-13 18:36 +0000
      Re: multiple inheritance "Lew" <lew@1:261/38.remove-nlb-this> - 2012-08-13 18:36 +0000
        Re: multiple inheritance "Arne Vajhøj" <������
høj@1:261/38.remove-rj6-this> - 2012-08-18 18:36 +0000
      Re: multiple inheritance "Leif Roar Moldskred" <leif.roar.moldskred@1:261/38.remove-nlb-this> - 2012-08-13 18:36 +0000
        Re: multiple inheritance "markspace" <markspace@1:261/38.remove-nlb-this> - 2012-08-13 18:36 +0000
        Re: multiple inheritance "Arne Vajhøj" <������
høj@1:261/38.remove-rj6-this> - 2012-08-18 18:36 +0000
  Re: multiple inheritance "Jan Burse" <jan.burse@1:261/38.remove-s5y-this> - 2012-08-02 19:12 +0000

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