Hi, There is any way to fix this situation (I have try to simplyfy the scenario as much as i could):
public class Test {
public static void main(String [] args) {
/* HERE I would like to indicate that the CollectionGeneric
can be of something that extends Animal (but the constructor
doesn't allow wildcards) */
CollectionGeneric<? extends Animal> animalsCollectionGeneric =
new CollectionGeneric<Animal>();
List<? extends Animal> animals = getAnimals();
/* Why I cannt do that? */
animalsCollectionGeneric.setBeans(animals);
}
private static List<? extends Animal> getAnimals() {
return new ArrayList<Dog>();
}
}
class CollectionGeneric<T> {
private List<T> beans;
public List<T> getBeans() {
return (beans != null) ? beans : new ArrayList<T>();
}
public void setBeans(List<T> beans) {
this.beans = beans;
}
}
interface Animal {}
class Dog implements Animal{}
this scenario is giving me the next error:
The method setBeans(List<capture#2-of ? extends Animal>) in the type
CollectionGeneric<capture#2-of ? extends Animal> is not applicable for
the arguments (List<capture#3-of ? extends Animal>)*
I am not sure about if there is a way to do this with generics,