Java的Queue类是Java集合框架的一部分,提供了在Java程序中处理队列的标准方式。 One of the most commonly used methods in the Queue class is the add() method, which inserts an element at the rear of the queue if it is possible to do
Summary of Queue methods Throws exception Returns special value Insert add(e) offer(e) Remove remove() poll() Examine element() peek() 队列通常(但不一定)以FIFO(先进先出)方式对元素进行排序。 其中的例外是优先级队列,它根据提供的比较器对元素进行排序,或者元素的自然顺序,以及LIFO队列(或堆栈),它...
从上图可以看到,Deque不仅具有FIFO的Queue实现,也有FILO的实现,也就是不仅可以实现队列,也可以实现一个堆栈。 同时在Deque的体系结构图中可以看到,实现一个Deque可以使用数组(ArrayDeque),同时也可以使用链表(LinkedList),还可以同实现一个支持阻塞的线程安全版本队列LinkedBlockingDeque。 1、ArrayDeque实现Deque 对于数组...
ConcurrentLinkedQueue is an unbounded thread-safe Queue based on linked nodes. All Queues supports insertion at the tail of the queue and removal at the head of the queue, except Deques. Deques are queues but they support element insertion and removal at both ends. (Java Queue Class Diagram...
Epop();// *** Collection methods ***booleanremove(Object o); booleancontains(Object o); public intsize(); Iterator<E>iterator(); Iterator<E>descendingIterator(); } Deque的接口和上面的Queue的操作基本相同。xxxFirst操作队列头部元素,xxxLast操作队列尾部元素。
* @ClassName : BlockingQueueMethodsExample * @Description : BlockingQueue常用方法 */public class BlockingQueueMethodsExample { // 创建一个容量为3的阻塞队列 private static BlockingQueue<String> blockingQueue = new ArrayBlockingQueue<>(3); // 创建一个生产者线程类 static class Producer...
Queueimplementations generally do not define element-based versions of methodsequalsandhashCodebut instead inherit the identity based versions from classObject, because element-based equality is not always well-defined for queues with the same elements but different ordering properties. ...
While this class implements the BlockingQueue interface, it intentionally violates the general contract of BlockingQueue, in that the following methods disregard the presence of unexpired elements and only ever remove the expired head: #poll() ...
// *** Queue methods *** boolean add(E e); boolean offer(E e); E remove(); E poll(); E element(); E peek(); // *** Stack methods *** void push(E e); E pop(); // *** Collection methods *** boolean remove(Object o); ...
我们都知道队列(Queue)是一种先进先出(FIFO)的数据结构,Java中定义了java.util.Queue接口用来表示队列。Java中的Queue与List、Set属于同一个级别接口,它们都是继承于Collection接口。 Java中还定义了一种双端队列java.util.Deque,我们常用的LinkedList就是实现了Deque接口。 下面我们看一下类的定义: Queue & Deque ...