JAVA Collection framework implements various interfaces, Collection interface and Map interface (java.util.Map) are the mainly used interfaces of Java Collection Framework. List of interfaces of Collection Framework is given below:
1. Collection interface: Collection (java.util.Collection) is the primary interface, and every collection must implement this interface.
Syntax:
- public interface Collection<E>extends Iterable
Where <E> represents that this interface is of Generic type
2. List interface: List interface extends the Collection interface, and it is an ordered collection of objects. It contains duplicate elements. It also allows random access of elements.
Syntax:
- public interface List<E> extends Collection<E>
3. Set interface: Set (java.util.Set) interface is a collection which cannot contain duplicate elements. It can only include inherited methods of Collection interface
Syntax:
- public interface Set<E> extends Collection<E>
Queue interface: Queue (java.util.Queue) interface defines queue data structure, which stores the elements in the form FIFO (first in first out).
Syntax:
- public interface Queue<E> extends Collection<E>
4. Dequeue interface: it is a double-ended-queue. It allows the insertion and removal of elements from both ends. It implants the properties of both Stack and queue so it can perform LIFO (Last in first out) stack and FIFO (first in first out) queue,operations.Syntax:
- public interface Dequeue<E> extends Queue<E>
5. Map interface: A Map (java.util.Map) represents a key, value pair storage of elements. Map interface does not implement the Collection interface. It can only contain a unique key but can have duplicate elements. There are two interfaces which implement Map in java that are Map interface and Sorted Map.
