Collections Framework

A collection is a container that helps to group multiple elements into a single unit. collections help to store, retrieve and manipulate data.

In java, the collections framework provides a set of interfaces and classes for storing and manipulating groups of objects in a standardized way. The collections framework was developed with following objectives in mind:

Ø      High performance

                  It should be of high-performance.

Ø      Interoperability

The different types of collections should work similar to each other and should have    interoperability

Ø      Easy to extend

                  It should be easy to extend a collection.