14-03-25
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                                       Java Collection Framework
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Q)How to create a group of objects in Java?
     1)using an array
     2)using a collection
Q)What are the limitations of arrays in dealing with a group of objects?
    1)size is fixed once created(i.e. an array is neither shrinkable nor growable)

    2)API support(library support) is missing to deal with the group of
    objects 
=>Because of the lack of resizable nature of an array, either memory will be wasted
or memory will not be sufficient in the application.

=>If we use an array to represent a group of objects(collection of objects), we need to write
lot of logic for storing,deleting, updating and retrieving of objects.

Note:- collections overcome the limitations of arrays.

Q)What is a collection ?
=>A collection is a Java object that stores other Java objects.
=>A collection is a group of objects that is treated as a single entity.

Q)What is the theme of collection framework?
=>Dealing with application objects in an object oriented manner is the theme
of Java collection framework.

=>whenever we need to perform CRUD operations on application objects, collection
framework is the solution.

          C- CREATION(INSERTION/STORING)
	  R- RETRIEVAL
	  U- UDATION
	  D- DELETION

Q)What is Java collection framework?
=>Java collection framework is a unified architecture for representing and manipulating
a collection of (group of) objects.

=>Java collections framework consists of three things.

              1)interfaces
	      2)implementation classes
	      3)Algorithms

Q)How are collections classified?
     1)list based collections
     2)set based collections
     3)map based collection
=>java.util.List interface is used to represent list based collections.
=>java.util.Set interface is used to represent set based collections.
=>java.util.Map interface is used to represent map based collections