COLLECTIONS IN JAVA

There are two "groups" of interfaces: Collection's and Map's.

Here is a graphical overview of the Collection interface hierarchy:

Collection Subtypes

The following interfaces (collection types) extends the Collection interface:

• List
• Set
• SortedSet
• NavigableSet
• Queue
• Deque

Instance Creations:
1.List

List listA = new ArrayList();
List listB = new LinkedList();
List listC = new Vector();
List listD = new Stack();   

2.Set 

Set setA = new EnumSet();
Set setB = new HashSet();
Set setC = new LinkedHashSet();
Set setD = new TreeSet();

3.SortedSet

SortedSet setA = new TreeSet();

Comparator comparator = new MyComparator();
SortedSet setB = new TreeSet(comparator);

4.NavigableSet

NavigableSet original = new TreeSet();