Is there a standard Java List implementation that doesn't allow adding null to it?

Question

Say I have a List and I know that I never want to add null to it. If I am adding null to it, it means I\'m making a mistake. So every time I would

Answer 1

Use Apache Commons Collection:

ListUtils.predicatedList(new ArrayList(), PredicateUtils.notNullPredicate());

Adding null to this list throws IllegalArgumentException. Furthermore you can back it by any List implementation you like and if necessary you can add more Predicates to be checked.

Same exists for Collections in general.

Use Google Guava:

Constraints.constrainedList(new ArrayList(), Constraints.notNull())

Adding null to this list throws NullPointerException.