Collections

The Java Collections Framework is a collection of interfaces and classes which helps in storing and processing the data efficiently. This framework has several useful classes which have tons of useful functions which makes a programmer task super easy.

Here are the main concepts of collections: 

MAP(interface)

         |---  AbstractMap

         |                WeakHashMap

         |                IdentityHashMap

         |                HashMap ----------> LinkedHashMap

         |                 TreeMap

         |

         |---  SortedMap

QUEUE

         |---DeQueue----> ArrayDeQueue

         |

         |---PriorityQueue

         

SET

         |--- HashSet

         |--- LinkedHashSet

         |--- SortedSet

                       |----- TreeSet

LIST

        |--- ArrayList

        |--- LinkedList

        |--- Vector

                    |--- Stack