public class LongArrayPriorityQueue extends java.lang.Object implements LongPriorityQueue, java.io.Serializable
Instances of this class represent a priority queue using a backing
array—all operations are performed directly on the array. The array is
enlarged as needed, but it is never shrunk. Use the trim()
method
to reduce its size, if necessary.
Constructor and Description |
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LongArrayPriorityQueue()
Creates a new empty queue using the natural order.
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LongArrayPriorityQueue(int capacity)
Creates a new empty queue with a given capacity and using the natural order.
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LongArrayPriorityQueue(int capacity,
LongComparator c)
Creates a new empty queue with a given capacity and comparator.
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LongArrayPriorityQueue(long[] a)
Wraps a given array in a queue using the natural order.
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LongArrayPriorityQueue(long[] a,
int size)
Wraps a given array in a queue using the natural order.
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LongArrayPriorityQueue(long[] a,
int size,
LongComparator c)
Wraps a given array in a queue using a given comparator.
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LongArrayPriorityQueue(long[] a,
LongComparator c)
Wraps a given array in a queue using a given comparator.
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LongArrayPriorityQueue(LongComparator c)
Creates a new empty queue with a given comparator.
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Modifier and Type | Method and Description |
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void |
changed()
Notifies the queue that the first element has changed (optional operation).
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void |
clear()
Removes all elements from this queue.
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LongComparator |
comparator()
Returns the comparator associated with this priority queue, or null if it uses its elements' natural ordering.
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long |
dequeueLong()
Dequeues the first element from the queue.
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void |
enqueue(long x)
Enqueues a new element.
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long |
firstLong()
Returns the first element of the queue.
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int |
size()
Returns the number of elements in this queue.
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void |
trim()
Trims the underlying array so that it has exactly
size() elements. |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
dequeue, enqueue, first, last, lastLong
isEmpty
public LongArrayPriorityQueue(int capacity, LongComparator c)
capacity
- the initial capacity of this queue.c
- the comparator used in this queue, or null
for the natural order.public LongArrayPriorityQueue(int capacity)
capacity
- the initial capacity of this queue.public LongArrayPriorityQueue(LongComparator c)
c
- the comparator used in this queue, or null
for the natural order.public LongArrayPriorityQueue()
public LongArrayPriorityQueue(long[] a, int size, LongComparator c)
The queue returned by this method will be backed by the given array.
a
- an array.size
- the number of elements to be included in the queue.c
- the comparator used in this queue, or null
for the natural order.public LongArrayPriorityQueue(long[] a, LongComparator c)
The queue returned by this method will be backed by the given array.
a
- an array.c
- the comparator used in this queue, or null
for the natural order.public LongArrayPriorityQueue(long[] a, int size)
The queue returned by this method will be backed by the given array.
a
- an array.size
- the number of elements to be included in the queue.public LongArrayPriorityQueue(long[] a)
The queue returned by this method will be backed by the given array.
a
- an array.public void enqueue(long x)
LongPriorityQueue
enqueue
in interface LongPriorityQueue
x
- the element to enqueue.PriorityQueue.enqueue(Object)
public long dequeueLong()
LongPriorityQueue
dequeueLong
in interface LongPriorityQueue
LongPriorityQueue.dequeue()
public long firstLong()
LongPriorityQueue
firstLong
in interface LongPriorityQueue
LongPriorityQueue.first()
public void changed()
PriorityQueue
This default implementation just throws an UnsupportedOperationException
.
changed
in interface PriorityQueue<java.lang.Long>
public int size()
PriorityQueue
size
in interface PriorityQueue<java.lang.Long>
public void clear()
PriorityQueue
clear
in interface PriorityQueue<java.lang.Long>
public void trim()
size()
elements.public LongComparator comparator()
LongPriorityQueue
comparator
in interface LongPriorityQueue
comparator
in interface PriorityQueue<java.lang.Long>
PriorityQueue.comparator()