Type Parameters:: E - the type of elements held in this collection

All Superinterfaces:: BlockingQueue<E>, Collection<E>, Deque<E>, Iterable<E>, Queue<E>

All Known Implementing Classes:: LinkedBlockingDeque

public interface BlockingDeque<E>
extends BlockingQueue<E>, Deque<E>

A Deque that additionally supports blocking operations that wait for the deque to become non-empty when retrieving an element, and wait for space to become available in the deque when storing an element.

BlockingDeque methods come in four forms, with different ways of handling operations that cannot be satisfied immediately, but may be satisfied at some point in the future: one throws an exception, the second returns a special value (either null or false, depending on the operation), the third blocks the current thread indefinitely until the operation can succeed, and the fourth blocks for only a given maximum time limit before giving up. These methods are summarized in the following table:

First Element (Head)
	Throws exception	Special value	Blocks	Times out
Insert	`addFirst(e)`	`offerFirst(e)`	`putFirst(e)`	`offerFirst(e, time, unit)`
Remove	`removeFirst()`	`pollFirst()`	`takeFirst()`	`pollFirst(time, unit)`
Examine	`getFirst()`	`peekFirst()`	not applicable	not applicable
Last Element (Tail)
	Throws exception	Special value	Blocks	Times out
Insert	`addLast(e)`	`offerLast(e)`	`putLast(e)`	`offerLast(e, time, unit)`
Remove	`removeLast()`	`pollLast()`	`takeLast()`	`pollLast(time, unit)`
Examine	`getLast()`	`peekLast()`	not applicable	not applicable

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Like any BlockingQueue, a BlockingDeque is thread safe, does not permit null elements, and may (or may not) be capacity-constrained.

A BlockingDeque implementation may be used directly as a FIFO BlockingQueue. The methods inherited from the BlockingQueue interface are precisely equivalent to BlockingDeque methods as indicated in the following table:

`BlockingQueue` Method	Equivalent `BlockingDeque` Method
Insert
`add(e)`	`addLast(e)`
`offer(e)`	`offerLast(e)`
`put(e)`	`putLast(e)`
`offer(e, time, unit)`	`offerLast(e, time, unit)`
Remove
`remove()`	`removeFirst()`
`poll()`	`pollFirst()`
`take()`	`takeFirst()`
`poll(time, unit)`	`pollFirst(time, unit)`
Examine
`element()`	`getFirst()`
`peek()`	`peekFirst()`

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Memory consistency effects: As with other concurrent collections, actions in a thread prior to placing an object into a BlockingDeque happen-before actions subsequent to the access or removal of that element from the BlockingDeque in another thread.

This interface is a member of the Java Collections Framework.

Since:: 1.6

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`add(E e)` Inserts the specified element into the queue represented by this deque (in other words, at the tail of this deque) if it is possible to do so immediately without violating capacity restrictions, returning `true` upon success and throwing an `IllegalStateException` if no space is currently available.
`void`	`addFirst(E e)` Inserts the specified element at the front of this deque if it is possible to do so immediately without violating capacity restrictions, throwing an `IllegalStateException` if no space is currently available.
`void`	`addLast(E e)` Inserts the specified element at the end of this deque if it is possible to do so immediately without violating capacity restrictions, throwing an `IllegalStateException` if no space is currently available.
`boolean`	`contains(Object o)` Returns `true` if this deque contains the specified element.
`E`	`element()` Retrieves, but does not remove, the head of the queue represented by this deque (in other words, the first element of this deque).
`Iterator<E>`	`iterator()` Returns an iterator over the elements in this deque in proper sequence.
`boolean`	`offer(E e)` Inserts the specified element into the queue represented by this deque (in other words, at the tail of this deque) if it is possible to do so immediately without violating capacity restrictions, returning `true` upon success and `false` if no space is currently available.
`boolean`	`offer(E e, long timeout, TimeUnit unit)` Inserts the specified element into the queue represented by this deque (in other words, at the tail of this deque), waiting up to the specified wait time if necessary for space to become available.
`boolean`	`offerFirst(E e)` Inserts the specified element at the front of this deque if it is possible to do so immediately without violating capacity restrictions, returning `true` upon success and `false` if no space is currently available.
`boolean`	`offerFirst(E e, long timeout, TimeUnit unit)` Inserts the specified element at the front of this deque, waiting up to the specified wait time if necessary for space to become available.
`boolean`	`offerLast(E e)` Inserts the specified element at the end of this deque if it is possible to do so immediately without violating capacity restrictions, returning `true` upon success and `false` if no space is currently available.
`boolean`	`offerLast(E e, long timeout, TimeUnit unit)` Inserts the specified element at the end of this deque, waiting up to the specified wait time if necessary for space to become available.
`E`	`peek()` Retrieves, but does not remove, the head of the queue represented by this deque (in other words, the first element of this deque), or returns `null` if this deque is empty.
`E`	`poll()` Retrieves and removes the head of the queue represented by this deque (in other words, the first element of this deque), or returns `null` if this deque is empty.
`E`	`poll(long timeout, TimeUnit unit)` Retrieves and removes the head of the queue represented by this deque (in other words, the first element of this deque), waiting up to the specified wait time if necessary for an element to become available.
`E`	`pollFirst(long timeout, TimeUnit unit)` Retrieves and removes the first element of this deque, waiting up to the specified wait time if necessary for an element to become available.
`E`	`pollLast(long timeout, TimeUnit unit)` Retrieves and removes the last element of this deque, waiting up to the specified wait time if necessary for an element to become available.
`void`	`push(E e)` Pushes an element onto the stack represented by this deque.
`void`	`put(E e)` Inserts the specified element into the queue represented by this deque (in other words, at the tail of this deque), waiting if necessary for space to become available.
`void`	`putFirst(E e)` Inserts the specified element at the front of this deque, waiting if necessary for space to become available.
`void`	`putLast(E e)` Inserts the specified element at the end of this deque, waiting if necessary for space to become available.
`E`	`remove()` Retrieves and removes the head of the queue represented by this deque (in other words, the first element of this deque).
`boolean`	`remove(Object o)` Removes the first occurrence of the specified element from this deque.
`boolean`	`removeFirstOccurrence(Object o)` Removes the first occurrence of the specified element from this deque.
`boolean`	`removeLastOccurrence(Object o)` Removes the last occurrence of the specified element from this deque.
`int`	`size()` Returns the number of elements in this deque.
`E`	`take()` Retrieves and removes the head of the queue represented by this deque (in other words, the first element of this deque), waiting if necessary until an element becomes available.
`E`	`takeFirst()` Retrieves and removes the first element of this deque, waiting if necessary until an element becomes available.
`E`	`takeLast()` Retrieves and removes the last element of this deque, waiting if necessary until an element becomes available.

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Methods inherited from interface java.util.concurrent.BlockingQueue
drainTo, drainTo, remainingCapacity

Methods inherited from interface java.util.Deque
descendingIterator, getFirst, getLast, peekFirst, peekLast, pollFirst, pollLast, pop, removeFirst, removeLast

Methods inherited from interface java.util.Collection
addAll, clear, containsAll, equals, hashCode, isEmpty, removeAll, retainAll, toArray, toArray

- Method Detail
  - addFirst
```
void addFirst(E e)
```
    Inserts the specified element at the front of this deque if it is possible to do so immediately without violating capacity restrictions, throwing an IllegalStateException if no space is currently available. When using a capacity-restricted deque, it is generally preferable to use offerFirst.
    
    Specified by:
    
    addFirst in interface Deque<E>
    
    Parameters:
    e - the element to add
    
    Throws:
    
    IllegalStateException - if the element cannot be added at this time due to capacity restrictions
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque
  - addLast
```
void addLast(E e)
```
    Inserts the specified element at the end of this deque if it is possible to do so immediately without violating capacity restrictions, throwing an IllegalStateException if no space is currently available. When using a capacity-restricted deque, it is generally preferable to use offerLast.
    
    Specified by:
    
    addLast in interface Deque<E>
    
    Parameters:
    e - the element to add
    
    Throws:
    
    IllegalStateException - if the element cannot be added at this time due to capacity restrictions
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque
  - offerFirst
```
boolean offerFirst(E e)
```
    Inserts the specified element at the front of this deque if it is possible to do so immediately without violating capacity restrictions, returning true upon success and false if no space is currently available. When using a capacity-restricted deque, this method is generally preferable to the addFirst method, which can fail to insert an element only by throwing an exception.
    
    Specified by:
    
    offerFirst in interface Deque<E>
    
    Parameters:
    e - the element to add
    
    Returns:
    true if the element was added to this deque, else false
    
    Throws:
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque
  - offerLast
```
boolean offerLast(E e)
```
    Inserts the specified element at the end of this deque if it is possible to do so immediately without violating capacity restrictions, returning true upon success and false if no space is currently available. When using a capacity-restricted deque, this method is generally preferable to the addLast method, which can fail to insert an element only by throwing an exception.
    
    Specified by:
    
    offerLast in interface Deque<E>
    
    Parameters:
    e - the element to add
    
    Returns:
    true if the element was added to this deque, else false
    
    Throws:
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque
  - putFirst
```
void putFirst(E e)
              throws InterruptedException
```
    Inserts the specified element at the front of this deque, waiting if necessary for space to become available.
    
    Parameters:
    e - the element to add
    
    Throws:
    
    InterruptedException - if interrupted while waiting
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque
  - putLast
```
void putLast(E e)
             throws InterruptedException
```
    Inserts the specified element at the end of this deque, waiting if necessary for space to become available.
    
    Parameters:
    e - the element to add
    
    Throws:
    
    InterruptedException - if interrupted while waiting
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque
  - offerFirst
```
boolean offerFirst(E e,
                 long timeout,
                 TimeUnit unit)
                   throws InterruptedException
```
    Inserts the specified element at the front of this deque, waiting up to the specified wait time if necessary for space to become available.
    
    Parameters:
    e - the element to add
    timeout - how long to wait before giving up, in units of unit
    unit - a TimeUnit determining how to interpret the timeout parameter
    
    Returns:
    true if successful, or false if the specified waiting time elapses before space is available
    
    Throws:
    
    InterruptedException - if interrupted while waiting
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque
  - offerLast
```
boolean offerLast(E e,
                long timeout,
                TimeUnit unit)
                  throws InterruptedException
```
    Inserts the specified element at the end of this deque, waiting up to the specified wait time if necessary for space to become available.
    
    Parameters:
    e - the element to add
    timeout - how long to wait before giving up, in units of unit
    unit - a TimeUnit determining how to interpret the timeout parameter
    
    Returns:
    true if successful, or false if the specified waiting time elapses before space is available
    
    Throws:
    
    InterruptedException - if interrupted while waiting
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque
  - takeFirst
```
E takeFirst()
            throws InterruptedException
```
    Retrieves and removes the first element of this deque, waiting if necessary until an element becomes available.
    
    Returns:
    the head of this deque
    
    Throws:
    
    InterruptedException - if interrupted while waiting
  - takeLast
```
E takeLast()
           throws InterruptedException
```
    Retrieves and removes the last element of this deque, waiting if necessary until an element becomes available.
    
    Returns:
    the tail of this deque
    
    Throws:
    
    InterruptedException - if interrupted while waiting
  - pollFirst
```
E pollFirst(long timeout,
          TimeUnit unit)
            throws InterruptedException
```
    Retrieves and removes the first element of this deque, waiting up to the specified wait time if necessary for an element to become available.
    
    Parameters:
    timeout - how long to wait before giving up, in units of unit
    unit - a TimeUnit determining how to interpret the timeout parameter
    
    Returns:
    the head of this deque, or null if the specified waiting time elapses before an element is available
    
    Throws:
    
    InterruptedException - if interrupted while waiting
  - pollLast
```
E pollLast(long timeout,
         TimeUnit unit)
           throws InterruptedException
```
    Retrieves and removes the last element of this deque, waiting up to the specified wait time if necessary for an element to become available.
    
    Parameters:
    timeout - how long to wait before giving up, in units of unit
    unit - a TimeUnit determining how to interpret the timeout parameter
    
    Returns:
    the tail of this deque, or null if the specified waiting time elapses before an element is available
    
    Throws:
    
    InterruptedException - if interrupted while waiting
  - removeFirstOccurrence
```
boolean removeFirstOccurrence(Object o)
```
    Removes the first occurrence of the specified element from this deque. If the deque does not contain the element, it is unchanged. More formally, removes the first element e such that o.equals(e) (if such an element exists). Returns true if this deque contained the specified element (or equivalently, if this deque changed as a result of the call).
    
    Specified by:
    
    removeFirstOccurrence in interface Deque<E>
    
    Parameters:
    o - element to be removed from this deque, if present
    
    Returns:
    true if an element was removed as a result of this call
    
    Throws:
    
    ClassCastException - if the class of the specified element is incompatible with this deque (optional)
    
    NullPointerException - if the specified element is null (optional)
  - removeLastOccurrence
```
boolean removeLastOccurrence(Object o)
```
    Removes the last occurrence of the specified element from this deque. If the deque does not contain the element, it is unchanged. More formally, removes the last element e such that o.equals(e) (if such an element exists). Returns true if this deque contained the specified element (or equivalently, if this deque changed as a result of the call).
    
    Specified by:
    
    removeLastOccurrence in interface Deque<E>
    
    Parameters:
    o - element to be removed from this deque, if present
    
    Returns:
    true if an element was removed as a result of this call
    
    Throws:
    
    ClassCastException - if the class of the specified element is incompatible with this deque (optional)
    
    NullPointerException - if the specified element is null (optional)
  - add
```
boolean add(E e)
```
    Inserts the specified element into the queue represented by this deque (in other words, at the tail of this deque) if it is possible to do so immediately without violating capacity restrictions, returning true upon success and throwing an IllegalStateException if no space is currently available. When using a capacity-restricted deque, it is generally preferable to use offer.
    This method is equivalent to addLast.
    
    Specified by:
    
    add in interface BlockingQueue<E>
    
    Specified by:
    
    add in interface Collection<E>
    
    Specified by:
    
    add in interface Deque<E>
    
    Specified by:
    
    add in interface Queue<E>
    
    Parameters:
    e - the element to add
    
    Returns:
    true (as specified by Collection.add(E))
    
    Throws:
    
    IllegalStateException - if the element cannot be added at this time due to capacity restrictions
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque
  - offer
```
boolean offer(E e)
```
    Inserts the specified element into the queue represented by this deque (in other words, at the tail of this deque) if it is possible to do so immediately without violating capacity restrictions, returning true upon success and false if no space is currently available. When using a capacity-restricted deque, this method is generally preferable to the add(E) method, which can fail to insert an element only by throwing an exception.
    This method is equivalent to offerLast.
    
    Specified by:
    
    offer in interface BlockingQueue<E>
    
    Specified by:
    
    offer in interface Deque<E>
    
    Specified by:
    
    offer in interface Queue<E>
    
    Parameters:
    e - the element to add
    
    Returns:
    true if the element was added to this queue, else false
    
    Throws:
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque
  - put
```
void put(E e)
         throws InterruptedException
```
    Inserts the specified element into the queue represented by this deque (in other words, at the tail of this deque), waiting if necessary for space to become available.
    This method is equivalent to putLast.
    
    Specified by:
    
    put in interface BlockingQueue<E>
    
    Parameters:
    e - the element to add
    
    Throws:
    
    InterruptedException - if interrupted while waiting
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque
  - offer
```
boolean offer(E e,
            long timeout,
            TimeUnit unit)
              throws InterruptedException
```
    Inserts the specified element into the queue represented by this deque (in other words, at the tail of this deque), waiting up to the specified wait time if necessary for space to become available.
    This method is equivalent to offerLast.
    
    Specified by:
    
    offer in interface BlockingQueue<E>
    
    Parameters:
    e - the element to add
    timeout - how long to wait before giving up, in units of unit
    unit - a TimeUnit determining how to interpret the timeout parameter
    
    Returns:
    true if the element was added to this deque, else false
    
    Throws:
    
    InterruptedException - if interrupted while waiting
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque
  - remove
```
E remove()
```
    Retrieves and removes the head of the queue represented by this deque (in other words, the first element of this deque). This method differs from poll only in that it throws an exception if this deque is empty.
    This method is equivalent to removeFirst.
    
    Specified by:
    
    remove in interface Deque<E>
    
    Specified by:
    
    remove in interface Queue<E>
    
    Returns:
    the head of the queue represented by this deque
    
    Throws:
    
    NoSuchElementException - if this deque is empty
  - poll
```
E poll()
```
    Retrieves and removes the head of the queue represented by this deque (in other words, the first element of this deque), or returns null if this deque is empty.
    This method is equivalent to Deque.pollFirst().
    
    Specified by:
    
    poll in interface Deque<E>
    
    Specified by:
    
    poll in interface Queue<E>
    
    Returns:
    the head of this deque, or null if this deque is empty
  - take
```
E take()
       throws InterruptedException
```
    Retrieves and removes the head of the queue represented by this deque (in other words, the first element of this deque), waiting if necessary until an element becomes available.
    This method is equivalent to takeFirst.
    
    Specified by:
    
    take in interface BlockingQueue<E>
    
    Returns:
    the head of this deque
    
    Throws:
    
    InterruptedException - if interrupted while waiting
  - poll
```
E poll(long timeout,
     TimeUnit unit)
       throws InterruptedException
```
    Retrieves and removes the head of the queue represented by this deque (in other words, the first element of this deque), waiting up to the specified wait time if necessary for an element to become available.
    This method is equivalent to pollFirst.
    
    Specified by:
    
    poll in interface BlockingQueue<E>
    
    Parameters:
    timeout - how long to wait before giving up, in units of unit
    unit - a TimeUnit determining how to interpret the timeout parameter
    
    Returns:
    the head of this deque, or null if the specified waiting time elapses before an element is available
    
    Throws:
    
    InterruptedException - if interrupted while waiting
  - element
```
E element()
```
    Retrieves, but does not remove, the head of the queue represented by this deque (in other words, the first element of this deque). This method differs from peek only in that it throws an exception if this deque is empty.
    This method is equivalent to getFirst.
    
    Specified by:
    
    element in interface Deque<E>
    
    Specified by:
    
    element in interface Queue<E>
    
    Returns:
    the head of this deque
    
    Throws:
    
    NoSuchElementException - if this deque is empty
  - peek
```
E peek()
```
    Retrieves, but does not remove, the head of the queue represented by this deque (in other words, the first element of this deque), or returns null if this deque is empty.
    This method is equivalent to peekFirst.
    
    Specified by:
    
    peek in interface Deque<E>
    
    Specified by:
    
    peek in interface Queue<E>
    
    Returns:
    the head of this deque, or null if this deque is empty
  - remove
```
boolean remove(Object o)
```
    Removes the first occurrence of the specified element from this deque. If the deque does not contain the element, it is unchanged. More formally, removes the first element e such that o.equals(e) (if such an element exists). Returns true if this deque contained the specified element (or equivalently, if this deque changed as a result of the call).
    This method is equivalent to removeFirstOccurrence.
    
    Specified by:
    
    remove in interface BlockingQueue<E>
    
    Specified by:
    
    remove in interface Collection<E>
    
    Specified by:
    
    remove in interface Deque<E>
    
    Parameters:
    o - element to be removed from this deque, if present
    
    Returns:
    true if this deque changed as a result of the call
    
    Throws:
    
    ClassCastException - if the class of the specified element is incompatible with this deque (optional)
    
    NullPointerException - if the specified element is null (optional)
  - contains
```
boolean contains(Object o)
```
    Returns true if this deque contains the specified element. More formally, returns true if and only if this deque contains at least one element e such that o.equals(e).
    
    Specified by:
    
    contains in interface BlockingQueue<E>
    
    Specified by:
    
    contains in interface Collection<E>
    
    Specified by:
    
    contains in interface Deque<E>
    
    Parameters:
    o - object to be checked for containment in this deque
    
    Returns:
    true if this deque contains the specified element
    
    Throws:
    
    ClassCastException - if the class of the specified element is incompatible with this deque (optional)
    
    NullPointerException - if the specified element is null (optional)
  - size
```
int size()
```
    Returns the number of elements in this deque.
    
    Specified by:
    
    size in interface Collection<E>
    
    Specified by:
    
    size in interface Deque<E>
    
    Returns:
    the number of elements in this deque
  - iterator
```
Iterator<E> iterator()
```
    Returns an iterator over the elements in this deque in proper sequence. The elements will be returned in order from first (head) to last (tail).
    
    Specified by:
    
    iterator in interface Collection<E>
    
    Specified by:
    
    iterator in interface Deque<E>
    
    Specified by:
    
    iterator in interface Iterable<E>
    
    Returns:
    an iterator over the elements in this deque in proper sequence
  - push
```
void push(E e)
```
    Pushes an element onto the stack represented by this deque. In other words, inserts the element at the front of this deque unless it would violate capacity restrictions.
    This method is equivalent to addFirst.
    
    Specified by:
    
    push in interface Deque<E>
    
    Parameters:
    e - the element to push
    
    Throws:
    
    IllegalStateException - if the element cannot be added at this time due to capacity restrictions
    
    ClassCastException - if the class of the specified element prevents it from being added to this deque
    
    NullPointerException - if the specified element is null
    
    IllegalArgumentException - if some property of the specified element prevents it from being added to this deque

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Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-java/util/concurrent/blockingdeque.html

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Interface BlockingDeque<E>

Method Summary

Methods inherited from interface java.util.concurrent.BlockingQueue

Methods inherited from interface java.util.Deque

Methods inherited from interface java.util.Collection

Method Detail

addFirst

addLast

offerFirst

offerLast

putFirst

putLast

offerFirst

offerLast

takeFirst

takeLast

pollFirst

pollLast

removeFirstOccurrence

removeLastOccurrence

add

offer

put

offer

remove

poll

take

poll

element

peek

remove

contains

size

iterator

push

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