队列是先进先出的数据结构,有些情况下数据是带有优先级的,一般出队列时,优先级高的元素先出队列 数据结构应该提供两个基本的数据结构,一个是返回最高优先级对象,一个是添加新的对象,这种数据结构就是优先级队列(Priority Queue) 2.Priority Queue模拟实现 PriorityQueue底层使用了堆的数据结构,而堆实际就是在完全二叉树
// Java Program Demonstratepeek()// method of PriorityBlockingQueueimportjava.util.concurrent.PriorityBlockingQueue;publicclassGFG{publicstaticvoidmain(String[] args){// define capacity of PriorityBlockingQueueintcapacityOfQueue =5;// create object of PriorityBlockingQueuePriorityBlockingQueue<Integer> Prio...
PrioQueue: [416165, 464161] Head of Queue: 416165 例2: 说明包含名称列表的 PriorityBlockingQueue 的 peek()方法。// Java Program Demonstrate peek() // method of PriorityBlockingQueue import java.util.concurrent.PriorityBlockingQueue; public class GFG { public static void main(String[] args) { ...
import java.util.concurrent.PriorityBlockingQueue; public class Main { public static void main(String[] args) throws InterruptedException { PriorityBlockingQueue<Integer> priorityBlockingQueue = new PriorityBlockingQueue<>(); priorityBlockingQueue.put(3); priorityBlockingQueue.put(1); priorityBlockingQueue...
Peek on tasks: task2 Peek on reverseTasks: task4 int size()- Returns the number of elements in the queue. boolean remove(Object o)- Removes the specified element from the queue, if it’s present. If two same elements are present, it only removes one of them. ...
出队方法有poll(), take(), poll(long timeout, TimeUnit unit),peek() poll 和 peek 与之前类似,这里不做说明。 public E take() throws InterruptedException { //获取锁,可被中断 final ReentrantLock lock = this.lock; lock.lockInterruptibly(); ...
Java并发基础:PriorityBlockingQueue全面解析! - 程序员古德 内容概要 PriorityBlockingQueue类能高效处理优先级任务,确保高优先级任务优先执行,它内部基于优先级堆实现,保证了元素的有序性,同时,作为BlockingQueue接口的实现,它提供了线程安全的队列操作,适用于多线程环境下的任务调度与资源管理,简洁而强大的API使得开发者...
从上面代码可以看出,执行element()方法时,先是获取peek()方法的结果,如果结果是null,则抛出NoSuchElementException异常。 4. PriorityBlockingQueue的单元测试 PriorityBlockingQueue的单元测试如下: package com.waylau.java.demo.datastructure; import static org.junit.jupiter.api.Assertions.assertEquals; import static ...
Java PriorityQueue is an unbounded Queue implementation that processes the items based on priorities. Custom ordering can be enforced with a Comparator.
1.. 优先队列(Priority Queue) 优先队列与普通队列的区别:普通队列遵循先进先出的原则;优先队列的出队顺序与入队顺序无关,与优先级相关。 优先队列可以使用队列的接口,只是在实现接口时,与普通队列有两处区别,一处在于优先队列出队的元素应该是优先级最高的元素,另一处在于队首元素也是优先级最高的元素。