Question

I’m having trouble using generics. Given the following example :

class A<T> {
  public A(Class<T> myType){
  }
}

class B<E> extends A<Collection<E>> {
  public B(Class<E> myEType){
    super(???);
  }
}

What ??? should be ?
Collection.class don’t work…
Collection<E>.class neither.
(Class<Collection<E>>)Collection.class do not work…

If there is a java generics guru, I need help… :/

Answer 1

You can’t possibly get a Class<Collection<E>> except for Collection.class, because of type erasure. You’ll have to use unsafe casts to cast a Collection.class to a Class<Collection<E>> — specifically, (Class<Collection<E>>) (Class) Collection.class will do the job.