What is AbstractQueue In Java ?

Previously we have discussed about

What is PriorityQueue In Java ?

Here we learn about AbstractQueue in Java,but before that we must know What is Queue Interface in Java ? and What is Collection Interface In Java ?

Class AbstractQueue<E>

Type Parameters:

E - the type of elements held in this collection

All Implemented Interfaces:

Iterable<E>, Collection<E>, Queue<E>

Direct Known Subclasses:

ArrayBlockingQueue, ConcurrentLinkedQueue, DelayQueue, LinkedBlockingDeque, LinkedBlockingQueue, LinkedTransferQueue, PriorityBlockingQueue, PriorityQueue, SynchronousQueue

Declaration of AbstractQueue:

public abstract class AbstractQueue<E>

extends AbstractCollection<E>

implements Queue<E>

AbstractQueue class provides skeletal implementations of some Queue operations.The implementations in this class are appropriate when the base implementation does not allow null elements.

Methods add, remove, and element are based on offer, poll, and peek, respectively, but throw exceptions instead of indicating failure via false or null returns.

This class is a member of the Java Collections Framework.

Constructor Summary of AbstractQueue:

Constructor	Description
protected AbstractQueue()	Constructor for use by subclasses.

Method Summary of AbstractQueue:

Modifier and Method Name	Description
boolean add(E e)	Inserts the specified element into this queue if it is possible to do so immediately without violating capacity restrictions, returning true upon success and throwing an IllegalStateException if no space is currently available.
boolean addAll(Collection<? extends E> c)	Adds all of the elements in the specified collection to this queue.
void clear()	Removes all of the elements from this queue.
E element()	Retrieves, but does not remove, the head of this queue.
E remove()	Retrieves and removes the head of this queue.

      

Blog Author - Pushkar Khosla,
Software Developer by Profession with 3.0 Yrs of Experience , through this blog i'am sharing my industrial Java Knowledge to entire world. For any question or query any one can comment below or mail me at pushkar.itsitm52@gmail.com.

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