Collection Frame work (Introduction)

Introduction :

This framework was introduced in JAVA SE v 1.2 

what is a collection object ?

Using an object to store a group of other objects, it means that we can use a class object as an array. such an

object is called ‘collection object’ or ‘container object’ .

We are using collection object to store 4 objects. A collection object has a class called as ‘collection class’ or ‘container class’.

all the collection classes are available in package java.util  . a group of collection classes is called collection frame work .

in fact, collection object can not store the physical copies of other objects, it stores only references of other objects .

The Interface and Classes of Java Collection Framework
Collection Interface
Iterator Interface
Set Interface
List Interface
ListIterator Interface
Map Interface
SortedSet Interface
SortedMap Interface
HashSet & TreeSet Classes
ArrayList & LinkedList Classes
HashMap & Treemap Classes
Vector and Stack Classes

Note : We can not store primitive data types in the collection objects. we can store only objects since the main aim of the collections is to handle objects only,not primitive data types.