## Uses of Class
java.util.AbstractQueue

- Packages that use AbstractQueue
  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 AbstractQueue in java.util

    Subclasses of AbstractQueue in java.util
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `PriorityQueue<E>` | An unbounded priority queue based on a priority heap.

  - ### Uses of AbstractQueue in java.util.concurrent

    Subclasses of AbstractQueue in java.util.concurrent
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `ArrayBlockingQueue<E>` | A bounded blocking queue backed by an array.
    `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 can only be taken 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.