E - the type of elements in this collectionpublic class CircularFifoQueue<E> extends AbstractCollection<E> implements Queue<E>, BoundedCollection<E>, Serializable
The removal order of a CircularFifoQueue is based on the
insertion order; elements are removed in the same order in which they
were added. The iteration order is the same as the removal order.
The add(Object), remove(), peek(), poll(),
offer(Object) operations all perform in constant time.
All other operations perform in linear time or worse.
This queue prevents null objects from being added.
| Constructor and Description |
|---|
CircularFifoQueue()
Constructor that creates a queue with the default size of 32.
|
CircularFifoQueue(Collection<? extends E> coll)
Constructor that creates a queue from the specified collection.
|
CircularFifoQueue(int size)
Constructor that creates a queue with the specified size.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
add(E element)
Adds the given element to this queue.
|
void |
clear()
Clears this queue.
|
E |
element() |
E |
get(int index)
Returns the element at the specified position in this queue.
|
boolean |
isAtFullCapacity()
Returns
true if the capacity limit of this queue has been reached,
i.e. |
boolean |
isEmpty()
Returns true if this queue is empty; false otherwise.
|
boolean |
isFull()
Returns true if this collection is full and no new elements can be added.
|
Iterator<E> |
iterator()
Returns an iterator over this queue's elements.
|
int |
maxSize()
Gets the maximum size of the collection (the bound).
|
boolean |
offer(E element)
Adds the given element to this queue.
|
E |
peek() |
E |
poll() |
E |
remove() |
int |
size()
Returns the number of elements stored in the queue.
|
addAll, contains, containsAll, remove, removeAll, retainAll, toArray, toArray, toStringclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitaddAll, contains, containsAll, equals, hashCode, parallelStream, remove, removeAll, removeIf, retainAll, spliterator, stream, toArray, toArraypublic CircularFifoQueue()
public CircularFifoQueue(int size)
size - the size of the queue (cannot be changed)IllegalArgumentException - if the size is < 1public CircularFifoQueue(Collection<? extends E> coll)
coll - the collection to copy into the queue, may not be nullNullPointerException - if the collection is nullpublic int size()
size in interface Collection<E>size in class AbstractCollection<E>public boolean isEmpty()
isEmpty in interface Collection<E>isEmpty in class AbstractCollection<E>public boolean isFull()
A CircularFifoQueue can never be full, thus this returns always
false.
isFull in interface BoundedCollection<E>falsepublic boolean isAtFullCapacity()
true if the capacity limit of this queue has been reached,
i.e. the number of elements stored in the queue equals its maximum size.true if the capacity limit has been reached, false otherwisepublic int maxSize()
maxSize in interface BoundedCollection<E>public void clear()
clear in interface Collection<E>clear in class AbstractCollection<E>public boolean add(E element)
add in interface Collection<E>add in interface Queue<E>add in class AbstractCollection<E>element - the element to addNullPointerException - if the given element is nullpublic E get(int index)
index - the position of the element in the queueindexNoSuchElementException - if the requested position is outside the range [0, size)public boolean offer(E element)
offer in interface Queue<E>element - the element to addNullPointerException - if the given element is nullCopyright © 2001–2019 The Apache Software Foundation. All rights reserved.