Lists

Abstract

While the Set interface is the simplest of the collection types (as it doesn’t add any behavior to the Collection interface), you’re more likely to use the List interface and its implementations: ArrayList and LinkedList. Beyond the basic collection capabilities, the List interface adds positional access to a collection so its elements have some kind of sequential order. Thus, when retrieving elements out of a list, instead of using an Iterator to visit each element, you can fetch a ListIterator to take advantage of that positioning in order to move in both directions.