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Re: multiple inheritance

 
 
Arne Vajhøj
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      08-20-2012
To: Leif Roar Moldskred
From: "=?UTF-8?B?QXJuZSBWYWpow7hq?=" <=?utf-8?b?qxjuzsbwywpow7hq?=@1:261/38.rem
ove-8mo-this>

To: Leif Roar Moldskred
From: "=?UTF-8?B?QXJuZSBWYWpow7hq?=" <=?utf-8?b?qxjuzsbwywpow7hq?=@1:261/38.rem
ove-v8v-this>

To: Leif Roar Moldskred
From: "=?UTF-8?B?QXJuZSBWYWpow7hq?=" <=?utf-8?b?qxjuzsbwywpow7hq?=@1:261/38.rem
ove-7rm-this>

To: Leif Roar Moldskred
From: "=?UTF-8?B?QXJuZSBWYWpow7hq?=" <=?utf-8?b?qxjuzsbwywpow7hq?=@1:261/38.rem
ove-rj6-this>

To: Leif Roar Moldskred
From: =?UTF-8?B?QXJuZSBWYWpow7hq?= <(E-Mail Removed)>

On 8/13/2012 6:55 AM, Leif Roar Moldskred wrote:
> Arne Vajh-,j <(E-Mail Removed)> 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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