| 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. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | ArrayDeque<E>Resizable-array implementation of the  Dequeinterface. | 
| class  | LinkedList<E>Doubly-linked list implementation of the  ListandDequeinterfaces. | 
| Modifier and Type | Method and Description | 
|---|---|
| static <T> Queue<T> | Collections. asLifoQueue(Deque<T> deque) | 
| Modifier and Type | Interface and Description | 
|---|---|
| interface  | BlockingDeque<E>A  Dequethat 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. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | ConcurrentLinkedDeque<E>An unbounded concurrent deque based on linked nodes. | 
| class  | LinkedBlockingDeque<E>An optionally-bounded blocking deque based on
 linked nodes. | 
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