Collection is the core framework developed in Java using design Patterns.
This framework provides the data structure architecture to store, retrieve and process the group of objects/elements.

Java Collections has so many interfaces like List, Map, Set, Queue, Vector.

List – Ordered collection of Objects, (Maintain Insertion Order)

Map – Collection of Key Value Pair Objects, which is unordered, allow duplicate values, however not allow duplicate keys.

Set – Collection of Key value Pair Objects, which is unordered does not allows duplicate Objects.

Queue – Maintain the basic data structure queue, FIFO (First In First Out)

These frameworks provide easy implementation on following features.,

• Insert/Delete/Update on list/group of element

Collection Interface, has abstract methods, like add(), remove() which needs to be implemented in their own algorithmic way.

• Search/Retrieve in the list/group of elements.,

Collection Interface has abstract methods like contains(), indexOf() which needs to be implemented in their own algorithmic way.