DoublePriorityQueues.SynchronizedPriorityQueue (fastutil 8.1.0)

java.lang.Object
- it.unimi.dsi.fastutil.doubles.DoublePriorityQueues.SynchronizedPriorityQueue

All Implemented Interfaces:

DoublePriorityQueue, PriorityQueue<Double>

Enclosing class:

DoublePriorityQueues
```
public static class DoublePriorityQueues.SynchronizedPriorityQueue
extends Object
implements DoublePriorityQueue
```
A synchronized wrapper class for priority queues.

Method Summary

All Methods Instance Methods Concrete Methods Deprecated 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.
`DoubleComparator`	`comparator()` Returns the comparator associated with this priority queue, or null if it uses its elements' natural ordering.
`Double`	`dequeue()` Deprecated.
`double`	`dequeueDouble()` Dequeues the first element from the queue.
`void`	`enqueue(double x)` Enqueues a new element.
`void`	`enqueue(Double x)` Deprecated.
`boolean`	`equals(Object o)` Indicates whether some other object is "equal to" this one.
`Double`	`first()` Deprecated.
`double`	`firstDouble()` Returns the first element of the queue.
`int`	`hashCode()` Returns a hash code value for the object.
`boolean`	`isEmpty()` Checks whether this queue is empty.
`Double`	`last()` Deprecated.
`double`	`lastDouble()` 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
getClass, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - enqueue
```
public void enqueue(double x)
```
    Description copied from interface: DoublePriorityQueue
    
    Enqueues a new element.
    
    Specified by:
    
    enqueue in interface DoublePriorityQueue
    
    Parameters:
    
    x - the element to enqueue.
    
    See Also:
    
    PriorityQueue.enqueue(Object)
  - dequeueDouble
```
public double dequeueDouble()
```
    Description copied from interface: DoublePriorityQueue
    
    Dequeues the first element from the queue.
    
    Specified by:
    
    dequeueDouble in interface DoublePriorityQueue
    
    Returns:
    
    the dequeued element.
    
    See Also:
    
    DoublePriorityQueue.dequeue()
  - firstDouble
```
public double firstDouble()
```
    Description copied from interface: DoublePriorityQueue
    
    Returns the first element of the queue.
    
    Specified by:
    
    firstDouble in interface DoublePriorityQueue
    
    Returns:
    
    the first element.
    
    See Also:
    
    DoublePriorityQueue.first()
  - lastDouble
```
public double lastDouble()
```
    Description copied from interface: DoublePriorityQueue
    
    Returns the last element of the queue, that is, the element the would be dequeued last (optional operation).
    This default implementation just throws an UnsupportedOperationException.
    
    Specified by:
    
    lastDouble in interface DoublePriorityQueue
    
    Returns:
    
    the last element.
    
    See Also:
    
    DoublePriorityQueue.last()
  - isEmpty
```
public boolean isEmpty()
```
    Description copied from interface: PriorityQueue
    
    Checks whether this queue is empty.
    This default implementation checks whether PriorityQueue.size() is zero.
    
    Specified by:
    
    isEmpty in interface PriorityQueue<Double>
    
    Returns:
    
    true if this queue is empty.
  - size
```
public int size()
```
    Description copied from interface: PriorityQueue
    
    Returns the number of elements in this queue.
    
    Specified by:
    
    size in interface PriorityQueue<Double>
    
    Returns:
    
    the number of elements in this queue.
  - clear
```
public void clear()
```
    Description copied from interface: PriorityQueue
    
    Removes all elements from this queue.
    
    Specified by:
    
    clear in interface PriorityQueue<Double>
  - changed
```
public void changed()
```
    Description copied from interface: PriorityQueue
    
    Notifies the queue that the first element has changed (optional operation).
    This default implementation just throws an UnsupportedOperationException.
    
    Specified by:
    
    changed in interface PriorityQueue<Double>
  - comparator
```
public DoubleComparator comparator()
```
    Description copied from interface: DoublePriorityQueue
    
    Returns the comparator associated with this priority queue, or null if it uses its elements' natural ordering.
    Note that this specification strengthens the one given in PriorityQueue.comparator().
    
    Specified by:
    
    comparator in interface DoublePriorityQueue
    
    Specified by:
    
    comparator in interface PriorityQueue<Double>
    
    Returns:
    
    the comparator associated with this priority queue.
    
    See Also:
    
    PriorityQueue.comparator()
  - enqueue
```
@Deprecated
public void enqueue(Double x)
```
    Deprecated.
    
    Description copied from interface: DoublePriorityQueue
    
    Enqueues a new element.
    This default implementation delegates to the corresponding type-specific method.
    
    Specified by:
    
    enqueue in interface DoublePriorityQueue
    
    Specified by:
    
    enqueue in interface PriorityQueue<Double>
    
    Parameters:
    
    x - the element to enqueue.
  - dequeue
```
@Deprecated
public Double dequeue()
```
    Deprecated.
    
    Description copied from interface: DoublePriorityQueue
    
    Dequeues the first element from the queue.
    This default implementation delegates to the corresponding type-specific method.
    
    Specified by:
    
    dequeue in interface DoublePriorityQueue
    
    Specified by:
    
    dequeue in interface PriorityQueue<Double>
    
    Returns:
    
    the dequeued element.
  - first
```
@Deprecated
public Double first()
```
    Deprecated.
    
    Description copied from interface: DoublePriorityQueue
    
    Returns the first element of the queue.
    This default implementation delegates to the corresponding type-specific method.
    
    Specified by:
    
    first in interface DoublePriorityQueue
    
    Specified by:
    
    first in interface PriorityQueue<Double>
    
    Returns:
    
    the first element.
  - last
```
@Deprecated
public Double last()
```
    Deprecated.
    
    Description copied from interface: DoublePriorityQueue
    
    Returns the last element of the queue, that is, the element the would be dequeued last (optional operation).
    This default implementation just throws an UnsupportedOperationException.
    This default implementation delegates to the corresponding type-specific method.
    
    Specified by:
    
    last in interface DoublePriorityQueue
    
    Specified by:
    
    last in interface PriorityQueue<Double>
    
    Returns:
    
    the last element.
  - hashCode
```
public int hashCode()
```
    Description copied from class: java.lang.Object
    Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.
    The general contract of hashCode is:
    - Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
    - If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
    - It is not required that if two objects are unequal according to the Object.equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.
    As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    a hash code value for this object.
    
    See Also:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
  - equals
```
public boolean equals(Object o)
```
    Description copied from class: java.lang.Object
    Indicates whether some other object is "equal to" this one.
    The equals method implements an equivalence relation on non-null object references:
    - It is reflexive: for any non-null reference value x, x.equals(x) should return true.
    - It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
    - It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
    - It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
    - For any non-null reference value x, x.equals(null) should return false.
    The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).
    Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    o - the reference object with which to compare.
    
    Returns:
    
    true if this object is the same as the obj argument; false otherwise.
    
    See Also:
    
    Object.hashCode(), HashMap

Class DoublePriorityQueues.SynchronizedPriorityQueue

Method Summary

Methods inherited from class java.lang.Object

Method Detail

enqueue

dequeueDouble

firstDouble

lastDouble

isEmpty

size

clear

changed

comparator

enqueue

dequeue

first

last

hashCode

equals