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Collections







Collections in java is a framework that provides an architecture to store and manipulate the group of objects.
All the operations that you perform on a data such as searching, sorting, insertion, manipulation, deletion etc. can be performed by Java Collections.
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).

What is framework in java

  1. provides readymade architecture.
  2. represents set of classes and interface.
  3. is optional.

What is Collection framework

Collection framework represents a unified architecture for storing and manipulating group of objects. It has:
  1. Interfaces and its implementations i.e. classes
  2. Algorithm

Hierarchy of Collection Framework

Let us see the hierarchy of collection framework.The java.util package contains all the classes and interfaces for Collection framework.
hierarchy of collection framework

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