Question

class A extends ApiClass
{
   public void duplicateMethod()
   {
   }
}    


class B extends AnotherApiClass
{
   public void duplicateMethod()
   {
   }
}

I have two classes which extend different api classes. The two class has some duplicate
methods(same method repeated in both class) and how to remove this duplication?

Edit

Both ApiClass and AnotherApiClass are not under my control

Answer 1

Sounds like a case for the “Strategy Pattern”.

class A extends ApiClass {
   private ClassContainingDupMethod strategy;
}

class N extends AnotherApiClass {
   private ClassContainingDupMethod strategy;

   public methodCallingDupMethod(){
      strategy.dupMethod();
   }
}

class ClassContainingDupMethod{
   public dupMethod(){;}
}

Or is the dupMethod inherted from the Api classes?