Collection in Java

Collections in Java Collections in java  is a framework that provides an architecture to store and manipulate the group of objects. Java Collection simply means a single unit of objects.  Java Collection framework provides many interfaces (Set, List, Queue, Deque etc.) and classes (ArrayList, Vector, LinkedList, PriorityQueue, HashSet, LinkedHashSet, TreeSet etc). Collection framework Collection framework represents a unified architecture for storing and manipulating group of objects. It has: Interfaces and its implementations i.e. classes Algorithm collection hierarchy: