Returnimng collection of interfaces
- by apoorv020
I have created the following interface
public interface ISolutionSpace {
public boolean isFeasible();
public boolean isSolution();
public Set<ISolutionSpace> generateChildren();
}
However, in the implementation of ISolutionSpace in a class called EightQueenSolutionSpace, I am going to return a set of EightQueenSolutionSpace instances, like the following stub:
@Override
public Set<ISolutionSpace> generateChildren() {
return new HashSet<EightQueenSolutionSpace>();
}
However this stub wont compile. What changes do I need to make?
EDIT: I tried 'HashSet' as well and had tried using the extends keyword. However since 'ISolutionSpace' is an interface and EightQueenSolutionSpace is an implementation(and not a subclass) of 'ISolutionSpace', it is still not working.
