Collection, Queue, Map, Set, List

🍁 Collection

• The root interface in the collection hierarchy. A collection represents a group of objects, known as its elements.

🍁 Queue

• A collection designed for holding elements prior to processing. Beside basic Collection operations, queues provide addition insertion, extraction, and inspection operations.

🍁 Map

• An object that maps keys to values. A map cannot contain duplicate keys; each key can map to at most one value.

🍁 Set

• A collection that contains no duplicate elements. More formally, sets contain no pair of elements e1 and e2 such that e1.equals(e2), and at most one null element.

🍁 List

• An ordered collection (also known as a sequence). The user of this interface has precise control where in the list each element is inserted. The user can access elements by their integer index (position in the list), and search for elements in the list.