Question

I have the following code using generics:

Set membersKeySet = membersList.keySet();
Iterator<DoubleKey> membersItr = membersKeySet.iterator();
while(membersItr.hasNext()){
    DoubleKey<Integer, Integer> dk =  membersItr.next();
}

Eclipse tells me that “Set is a raw type. References to generic type <E> should be parametrized”. DoubleKey is also a Generic class. What I understand is that the .iterator() method doesn’t assure that the DoubleKey Class has been passed with the same parameter types. I tried typecasting but it doesn’t work. How can I pull this off? Thanks!

P.S. I’m still n00b inusing Generics.

Answer 1

If the objects stored in the set are instances of DoubleKey<Integer, Integer>, then the code should look like this :

Set<DoubleKey<Integer, Integer>> membersKeySet = membersList.keySet();
Iterator<DoubleKey<Integer, Integer>> membersItr = membersKeySet.iterator();
while(membersItr.hasNext()){
    DoubleKey<Integer, Integer> dk =  membersItr.next();
}