Question

I have created two classes, class A that uses a Linked List and class B that uses an ArrayList. Both classes have a method add(), which adds an elements to the LinkedList or ArrayList reciprocally.

My question is: Is it possible to create another class, say C, such that C has its own method add() to add elements to a LIST, and class C is the parent of A and B and also that A and B inherit the add() method of class C without overriding it???

P.S: I tried to do this myself but I get an error because I cannot initialize a list in class C. I am using Java

Thank you in advance

Answer 1

It is possible. Below is the example. I haven’t compiled it as I just wanted to give you the idea.

class C
{
 protected List sharedList;

 public void add(Object o)
 {
   sharedList.add(o);
 }
}

class B extends C
{
 public B()
 {
   sharedList=new ArrayList();
  }
}

class A extends C
{
 public A()
 {
   sharedList=new LinkedList();
  }
}