Question

I have an empty abstract base class:

public abstract class base{ }

and two class that extend it:

public class a extends base{}
public class b extends base{}

and in another class I am referencing it :

public class it {

    List<base> list;
    list = new ArrayList<a>; 

    //getting an error above.
    // I thought I could do this?
}

What should I try? I was trying to have a list of the base class. Then based upon circumstance, be able to create a list of the two extending classes.

Answer 1

What if I wanted to do something like this:

List<b> getBList(){

  if (baseList instanceof b ){
      return (List<b>) baseList<base>;
  }
  else return null;

}