Java 的PriorityQueue 非线程安全,多线程环境需使用 PriorityBlockingQueue。 元素可变性:若元素属性变化可能破坏堆结构,需谨慎设计(如任务优先级动态调整需重新插入)。 PriorityQueue底层原理 数据结构PriorityQueue 基于堆数据结构实现,通常是最小堆。 tips: 堆中某个节点的值总是大于或等于其父节点的值,称为最小堆/...
AI代码解释 publicstaticvoidmain(String[]args){// 注意的是:它没有提供和PriorityQueue一样的只提供比较器的构造函数,我个人觉得是JDK忘了~~~PriorityBlockingQueue<String>priorityQueue=newPriorityBlockingQueue<>(11,Comparator.reverseOrder());priorityQueue.add("orange");priorityQueue.add("fig");priorityQueue....
public class PriorityBlockingQueue<E> extends AbstractQueue<E>implements BlockingQueue<E>, java.io.Serializable {public PriorityBlockingQueue() {this(DEFAULT_INITIAL_CAPACITY, null);}public PriorityBlockingQueue(int initialCapacity) {this(initialCapacity, null);}public PriorityBlockingQueue(int initialCapacit...
PriorityQueue是基于优先堆的一个无界队列,它是一个Queue 默认情况下它 根据自然排序,当然我们也可以定制比较器,自行自定义排序,从而实现自己的优先级逻辑。 // @since 1.5 public class PriorityQueue<E> extends AbstractQueue<E> implements java.io.Serializable { // 构造函数 public PriorityQueue() { this(DEFA...
PriorityQueue is an unbounded queue that grows dynamically. The default initial capacity is '11' which can be overridden using initialCapacity parameter in the appropriate constructor. It does not allow null. By default, the items in the priority queue are ordered in the natural order. The queue...
* @param comparator the comparator that will be used to order this * priority queue. If {@code null}, the {@linkplain Comparable * natural ordering} of the elements will be used. * 用于对此优先级队列进行排序的比较器。如果该参数为 null,则将使用元素的自然顺序 ...
classTask{intpriority;Stringdescription;Task(intpriority,Stringdescription){this.priority=priority;this.description=description;}}PriorityQueue<Task>taskQueue=newPriorityQueue<>(Comparator.comparingInt(task->task.priority));taskQueue.add(newTask(3,"Task 3"));taskQueue.add(newTask(1,"Task 1"));taskQu...
publicclassDemo{publicstaticvoidmain(String[] args){ PriorityQueue<Student> q =newPriorityQueue<>(100); printPriority(q); } } 运行结果 Type:longName: serialVersionUID Value:-7720805057305804111Type:intName: DEFAULT_INITIAL_CAPACITY Value:11Type:class[Ljava.lang.Object;Name: queue Value:[Ljava.lang...
Queue<Integer> pq =newPriorityQueue<>(11, Collections.reverseOrder()); 输出就会变为: 34 22 19 15 13 12 12 11 10 8 7 6 4 2 任务队列 我们再来看个例子,模拟一个任务队列,定义一个内部类Task表示任务,如下所示: staticclassTask {intpriority; ...
import java.util.Comparator; import java.util.concurrent.PriorityBlockingQueue; public class Main { public static void main(String[] args) { PriorityBlockingQueue<Integer> queue = new PriorityBlockingQueue<>(10, Comparator.reverseOrder()); // 生产者线程 Thread producer = new Thread(() -> { ...