# Uses of Interface
java.util.Queue

Packages that use Queue
Package
Description
java.util
Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.
java.util.concurrent
Utility classes commonly useful in concurrent programming.

## Uses of Queue in java.util

Subinterfaces of Queue in java.util
Modifier and Type
Interface
Description
`interface`
`Deque<E>`
A linear collection that supports element insertion and removal at both ends.
Classes in java.util that implement Queue
Modifier and Type
Class
Description
`class`
`AbstractQueue<E>`
This class provides skeletal implementations of some `Queue` operations.
`class`
`ArrayDeque<E>`
Resizable-array implementation of the `Deque` interface.
`class`
`LinkedList<E>`
Doubly-linked list implementation of the `List` and `Deque` interfaces.
`class`
`PriorityQueue<E>`
An unbounded priority queue based on a priority heap.
Methods in java.util that return Queue
Modifier and Type
Method
Description
`static <T> Queue<T>`
Collections.`asLifoQueue(Deque<T> deque)`
Returns a view of a `Deque` as a Last-in-first-out (Lifo) `Queue`.
`static <E> Queue<E>`
Collections.`checkedQueue(Queue<E> queue, Class<E> type)`
Returns a dynamically typesafe view of the specified queue.
Methods in java.util with parameters of type Queue
Modifier and Type
Method
Description
`static <E> Queue<E>`
Collections.`checkedQueue(Queue<E> queue, Class<E> type)`
Returns a dynamically typesafe view of the specified queue.

## Uses of Queue in java.util.concurrent

Subinterfaces of Queue in java.util.concurrent
Modifier and Type
Interface
Description
`interface`
`BlockingDeque<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.
`interface`
`BlockingQueue<E>`
A `Queue` that additionally supports operations that wait for the queue to become non-empty when retrieving an element, and wait for space to become available in the queue when storing an element.
`interface`
`TransferQueue<E>`
A `BlockingQueue` in which producers may wait for consumers to receive elements.
Classes in java.util.concurrent that implement Queue
Modifier and Type
Class
Description
`class`
`ArrayBlockingQueue<E>`
A bounded blocking queue backed by an array.
`class`
`ConcurrentLinkedDeque<E>`
An unbounded concurrent deque based on linked nodes.
`class`
`ConcurrentLinkedQueue<E>`
An unbounded thread-safe queue based on linked nodes.
`class`
`DelayQueue<E extends Delayed>`
An unbounded blocking queue of `Delayed` elements, in which an element generally becomes eligible for removal when its delay has expired.
`class`
`LinkedBlockingDeque<E>`
An optionally-bounded blocking deque based on linked nodes.
`class`
`LinkedBlockingQueue<E>`
An optionally-bounded blocking queue based on linked nodes.
`class`
`LinkedTransferQueue<E>`
An unbounded `TransferQueue` based on linked nodes.
`class`
`PriorityBlockingQueue<E>`
An unbounded blocking queue that uses the same ordering rules as class `PriorityQueue` and supplies blocking retrieval operations.
`class`
`SynchronousQueue<E>`
A blocking queue in which each insert operation must wait for a corresponding remove operation by another thread, and vice versa.