Any way to make a generic List where I can add a type AND a subtype?
- by user383178
I understand why I cannot do the following:
private class Parent {
};
private class Child extends Parent {
};
private class GrandChild extends Child {
};
public void wontCompile(List<? extends Parent> genericList, Child itemToAdd) {
genericList.add(itemToAdd);
}
My question is there ANY practical way to have a typesafe List where you can call add(E) where E is known to be only a Parent or a Child?
I vaguely remember some use of the "|" operator as used for wildcard bounds, but I cannot find it in the spec...
Thanks!
