## Uses of Class
java.util.AbstractQueue

- Packages that use AbstractQueue
  Package | Description
  --- | ---
  java.util | Contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array).
  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 and 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 and 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.

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