PriorityQueues.EmptyPriorityQueue (fastutil 6.5.7)

java.lang.Object
- it.unimi.dsi.fastutil.AbstractPriorityQueue
- - it.unimi.dsi.fastutil.PriorityQueues.EmptyPriorityQueue

All Implemented Interfaces:

PriorityQueue

Enclosing class:

PriorityQueues
```
public static class PriorityQueues.EmptyPriorityQueue
extends AbstractPriorityQueue
```
An immutable class representing the empty priority queue.
This class may be useful to implement your own in case you subclass PriorityQueue.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`changed()` Notifies the queue that the first element has changed (optional operation).
`void`	`clear()` Removes all elements from this queue.
`Comparator<?>`	`comparator()` Returns the comparator associated with this queue, or `null` if it uses its elements' natural ordering.
`Object`	`dequeue()` Dequeues the first element from the queue.
`void`	`enqueue(Object o)` Enqueues a new element.
`Object`	`first()` Returns the first element of the queue.
`boolean`	`isEmpty()` Checks whether the queue is empty.
`Object`	`last()` Returns the last element of the queue, that is, the element the would be dequeued last (optional operation).
`int`	`size()` Returns the number of elements in this queue.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - enqueue
```
public void enqueue(Object o)
```
    Description copied from interface: PriorityQueue
    
    Enqueues a new element.
    
    Parameters:
    o - the element to enqueue..
  - dequeue
```
public Object dequeue()
```
    Description copied from interface: PriorityQueue
    
    Dequeues the first element from the queue.
    
    Returns:
    the dequeued element.
  - isEmpty
```
public boolean isEmpty()
```
    Description copied from interface: PriorityQueue
    
    Checks whether the queue is empty.
    
    Specified by:
    
    isEmpty in interface PriorityQueue
    
    Overrides:
    
    isEmpty in class AbstractPriorityQueue
    
    Returns:
    true if the queue is empty.
  - size
```
public int size()
```
    Description copied from interface: PriorityQueue
    
    Returns the number of elements in this queue.
    
    Returns:
    the number of elements in this queue.
  - clear
```
public void clear()
```
    Description copied from interface: PriorityQueue
    
    Removes all elements from this queue.
  - first
```
public Object first()
```
    Description copied from interface: PriorityQueue
    
    Returns the first element of the queue.
    
    Returns:
    the first element.
  - last
```
public Object last()
```
    Description copied from interface: PriorityQueue
    
    Returns the last element of the queue, that is, the element the would be dequeued last (optional operation).
    
    Specified by:
    
    last in interface PriorityQueue
    
    Overrides:
    
    last in class AbstractPriorityQueue
    
    Returns:
    the last element.
  - changed
```
public void changed()
```
    Description copied from interface: PriorityQueue
    
    Notifies the queue that the first element has changed (optional operation).
    
    Specified by:
    
    changed in interface PriorityQueue
    
    Overrides:
    
    changed in class AbstractPriorityQueue
  - comparator
```
public Comparator<?> comparator()
```
    Description copied from interface: PriorityQueue
    
    Returns the comparator associated with this queue, or null if it uses its elements' natural ordering.
    
    Returns:
    the comparator associated with this sorted set, or null if it uses its elements' natural ordering.

Class PriorityQueues.EmptyPriorityQueue

Method Summary

Methods inherited from class java.lang.Object

Method Detail

enqueue

dequeue

isEmpty

size

clear

first

last

changed

comparator