帮我避免多重继承。帮助我得到正确的oo设计 [英] Help me to avoid multiple inheritance aka. help me to get proper oo design

问题描述

我有两个班级LightA和LightB。我有LightB的源代码，但不是LightA的源代码。我用LightDimDip扩展了LightB。即 LightDimDip：extends LightB 。现在我需要将DimDip功能应用于lightB。

任何人都可以提出良好的OOP设计。

再次提醒您，我无法修改LightA。

解决方案

灯是否有通用的界面？在这种情况下，我想你可以在这里使用装饰图案

  interface ILight {int GetIntensity（）} 
 class LightA ：ILight {int GetIntentisy（）{return 10; }} 
 class LightB：ILight {int GetIntensity（）{return 15; }} 
 
 class DimLight：ILight {
 public DimLight（ILight inner）{} 
 
 //添加行为inner 
 int GetIntensity（）{return inner.GetIntensity（）/ 2; 
} 
 
 ILight dimLightA = new DimLight（new LightA（））
 ILight dimLightB = new DimLight（new LightB（））
  

然后，您可以将Light行为放在DimLight类中，并将其应用于实现ILight的任何类。

I have two classes LightA and LightB. I have the source code of LightB but not that of LightA. I extended LightB with LightDimDip. ie LightDimDip:extends LightB. Now I need to apply DimDip feature to lightB also.

Can any one suggest good OOP design.

Once again I remind you people that I cannot modify LightA.

解决方案

Do the lights have a common interface? In which case I guess you could use the decorator pattern here

interface ILight { int GetIntensity() }
class LightA : ILight { int GetIntentisy(){ return 10; } }
class LightB : ILight { int GetIntensity(){ return 15; } }

class DimLight : ILight {
     public DimLight(ILight inner){}

     //Add behaviour inner
     int GetIntensity(){ return inner.GetIntensity() / 2; }
}

ILight dimLightA = new DimLight(new LightA())
ILight dimLightB = new DimLight(new LightB())

Then you can put the light behaviour in the DimLight class and apply it to any class which implements ILight.

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