(Timeunit.nanoseconds) method returns a value less than or equal to zero, the expiration occurs and poll removes the element. Null element is not allowed for this queue. The following is a delay interface:
Java code
Public interface delayed extends Comparable
The elements that are put into the delayqueue will also implement the CompareTo method, which delayqueue use to sort the elements.
The
Queues are an important part of the Java collection, with first-out features that allow for a wide range of application scenarios, such as queuing. So let's learn about queues in Java today. Examples of this article use the JAVA8 environment.Inheriting class diagramsThe learning queue, first to know its class inheritance system, know each kind of
returned.Object Remove (): Gets the element of the queue header and deletes the element.The queue interface has a Priorityqueue implementation class. In addition, the queue also has a deque interface, deque represents a "double-ended queue", the double-ended queue can be re
Principle:After a queue problem, the previous queue pops up and then inserts the array out of bounds. So this section is changed into a cyclic queue.The so-called circular queue is deleted to the end of the team to re-point to the team head, insert the data is full and then re-point to the team head, to achieve a loop.
exception if this $ * Queue is empty. $ * - * @returnThe head of this queue - * @throwsNosuchelementexception If this queue is empty the */ - E Remove ();Wuyi the /** - * Retrieves and removes the head of this queue, Wu * or returns {@codeNULL} If this que
.
Return:
The
header of the queue, which returns
null if this queue is empty
5, E
element
()
gets, but does not remove the header of this queue. This method
peek differs from the only difference in that this
. Concurrentlinkedqueue is an appropriate choice when multiple threads share access to a common collection. This queue does not allow the use of NULL elements.
Linkedblockingqueue
An arbitrarily scoped blocking queue based on the linked node. This queue sorts elements by FIFO (first-in, in-out). The head of the
of the queue, and the queue fetch operation starts from the queue header to obtain the element.
This is a typical "bounded buffer" with fixed-size arrays in which the producer inserts elements and the user extracts the elements. Once you create such a buffer, you can no longer increase its capacity. Attempting to put an element into a full
The other two branches of collection: list and set have been analyzed in the previous chapter to analyze the underlying implementation of the queue.Top three articles about the Java container class:Java Container class 1:collection,list,arraylist,linkedlist in-depth interpretation of Java container Classes 2:map and HashMap in-depth understanding of Java containe
Java concurrency: synchronization between threads-conditional queue and synchronization Tool
Synchronization between threads exists in addition to mutex (the mutex lock introduced earlier). Below we will introduce some common collaboration methods between java threads.I. built-in condition queue
Just as each
) The Deque interface is a sub-interface of the queue interface, which represents a double-ended queue.(2) LinkedList is the implementation class of the list interface, so it can be a collection that can randomly access elements in the collection based on the index. In addition, it is an implementation class for the Duque interface, so it can also be used as a double-ended
queue.
List 1. Working Queues with thread pools[Java]Public class WorkQueue{Private final int nThreads;Private final PoolWorker [] threads;Private final complete list queue;Public WorkQueue (int nThreads){This. nThreads = nThreads;Queue = new queue list ();Threads = new Poo
Java Data Structure Queue code implementation, can be easily into the queue and out of the queue operation/*** Implementation of the queue for Java data structures * 2016/4/27 **/ PackageCN. Link;ImportJava.util.*; Public classque
As a thread container, BlockingQueue can provide powerful guarantee for thread synchronization. The main methods used include:[Java]Add (E o); // add the specified element to this queue (if feasible immediately). true is returned upon success. In other cases, IllegalStateException is thrown.DrainTo (Collection DrainTo (Collection Offer (E o); // Insert the specified element into the
queues can be divided into three categories based on how they respond: The AAD, Removee, and element operations throw exceptions when you try to add elements to a full queue or to get elements from an empty queue. Of course, in multithreaded programs, the queue can become full or empty at any time, so you might want to use the offer, poll, peek method. These met
expansion, Because there is no need to replicate the original queue, it may be more efficient in some cases.It is also important to note that both implementations are not thread-safe and are therefore only suitable for use in single-threaded environments, and the Linkedblockingdeque described in the following sections are thread-safe and deque. In fact, it should be the most powerful queue implementation,
blockingqueue Interface1) List of unimplemented blocking interfaces: Java. util. Queue interface and Java. util. abstractqueue interface are implemented.Built-in non-blocking queue: priorityqueue and concurrent1_queueThe priorityqueue and concurrentincluqueue classes add two specific set implementations to the Collect
}119} while(true); - 121String temp = "1";122System.out.println ("Out of queue operation: Press any non-0 key to do the stack operation:");123temp =Input.next ();124 while(!temp.equals ("0")){ theData1 =St. Outsqtype (stack);126System.out.printf ("Out-of-queue data is (%s,%d) \ n", data1.name,data1.age);127temp =Input.next (); - }129SYSTEM.OUT.PRINTLN ("The test is over
In the C + + language, a lambda expression is constructed directly using a precedence queue, using an anonymous function pointer. The return value of the Java comparison function is not a bool type, only an integral type.
Internal corresponding C + + anonymous function:
Anonymous Comparator implementation
Auto Comparemax = [] (const cell a, const cell b) {return A.max
Corresponding
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