public class LongArrayFIFOQueue extends AbstractLongPriorityQueue
Instances of this class represent a FIFO queue using a backing
array in a circular way. The array is enlarged and shrunk as needed. You can use the trim() method
to reduce its memory usage, if necessary.
This class provides additional methods that implement a deque (double-ended queue).
| Modifier and Type | Field and Description |
|---|---|
static int |
INITIAL_CAPACITY
The standard initial capacity of a queue.
|
| Constructor and Description |
|---|
LongArrayFIFOQueue()
Creates a new empty queue with standard initial capacity.
|
LongArrayFIFOQueue(int capacity)
Creates a new empty queue with given capacity.
|
| Modifier and Type | Method and Description |
|---|---|
void |
clear()
Removes all elements from this queue.
|
LongComparator |
comparator()
Returns
null (FIFO queues have no comparator). |
long |
dequeueLastLong()
Dequeues the last element from the queue.
|
long |
dequeueLong()
Dequeues the first element from the queue.
|
void |
enqueue(long x)
Enqueues a new element.
|
void |
enqueueFirst(long x)
Enqueues a new element as the first element (in dequeuing order) of the queue.
|
long |
firstLong()
Returns the first element of the queue.
|
long |
lastLong()
Returns the last element of the queue.
|
int |
size()
Returns the number of elements in this queue.
|
void |
trim()
Trims the queue to the smallest possible size.
|
dequeue, enqueue, first, lastchanged, isEmptyequals, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitchanged, isEmptypublic static final int INITIAL_CAPACITY
public LongArrayFIFOQueue(int capacity)
capacity - the initial capacity of this queue.public LongArrayFIFOQueue()
public LongComparator comparator()
null (FIFO queues have no comparator).null.PriorityQueue.comparator()public long dequeueLong()
LongPriorityQueuepublic long dequeueLastLong()
NoSuchElementException - if the queue is empty.public void enqueue(long x)
LongPriorityQueuex - the element to enqueue.public void enqueueFirst(long x)
public long firstLong()
public long lastLong()
lastLong in interface LongPriorityQueuelastLong in class AbstractLongPriorityQueuepublic void clear()
PriorityQueuepublic void trim()
public int size()
PriorityQueue