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Subject: Re: multiple inheritance
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  To: Leif Roar Moldskred
From: =?UTF-8?B?QXJuZSBWYWpow7hq?= <arne@vajhoej.dk>

On 8/13/2012 6:55 AM, Leif Roar Moldskred wrote:
> 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( );
>    }
> }

You IDE should be able to generate the code for you.

But it could save some code in some cases.

Arne

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