Abstract Class Polymorphism?
I want to be able to add any of my sub classes to a collection (hash set) , without duplicating the code. The superclass for all these subclasses is an abstract class.
Is there a possible way of achieving this?
At the moment I have methods for each individual class; before making the parent class abstract, I could use the same method for all, but was advised as I did not want an instance of that parent class, the abstract class was best.
Hope this is not too vague or abstract... :)
[511 byte] By [
Craigusa] at [2007-11-26 18:47:25]
I think if you use the wildcard symbol it'll allow you to add a covariant to the collection, for example
public static void addSub(List<? super NameofSuperClass> varName)
When you can to retrieve the data, if you want any methods not in the super class you would still be to cast it.
Is this what you meant? - Peter sorry if it wasn't helpful
public abstract class Abs
{
public abstract void doStuff();
//...
}
public class Sub1 extends Abs {/*...*/}
public class Sub2 extends Abs {/*...*/}
//...
List<Abs> list = new ArrayList<Abs>();
list.add(new Sub1());
list.add(new Sub2());
for (Abs a : list)
a.doStuff();
#
