Java 中的 PriorityBlockingQueue take()方法
原文:https://www . geeksforgeeks . org/priorityblockingqueue-take-method-in-Java/
优先级阻塞队列 的 take() 方法移除后返回队列头。如果队列为空，则此方法将等待直到某个元素变得可用。
语法:
public E take() throws InterruptedException
返回:该方法返回该优先级阻塞队列的头的值。
异常:如果在等待元素可用时被中断，该方法将引发中断异常。
下面的程序说明了优先阻塞队列的 take()方法:
示例 1: 演示包含数字列表的 PriorityBlockingQueue 上的 take()方法。
// Java Program Demonstrate take()
// method of PriorityBlockingQueue
import java.util.concurrent.PriorityBlockingQueue;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws InterruptedException
{
// create object of PriorityBlockingQueue
PriorityBlockingQueue<Integer> PrioQueue
= new PriorityBlockingQueue<Integer>();
// Add numbers to PriorityBlockingQueue
PrioQueue.put(7855642);
PrioQueue.put(35658786);
PrioQueue.put(5278367);
PrioQueue.put(74381793);
// before removing print queue
System.out.println("Queue: " + PrioQueue);
// Apply take() method
int head = PrioQueue.take();
// Print head of queue using take() method
System.out.println("Head of PriorityBlockingQueue"
+ " using take(): " + head);
System.out.print("After removing head, Queue: "
+ PrioQueue);
}
}
输出:
Queue: [5278367, 35658786, 7855642, 74381793]
Head of PriorityBlockingQueue using take(): 5278367
After removing head, Queue: [7855642, 35658786, 74381793]
示例 2: 演示包含字符串
// Java Program Demonstrate take()
// method of PriorityBlockingQueue
import java.util.concurrent.PriorityBlockingQueue;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws InterruptedException
{
// create object of PriorityBlockingQueue
// which contains Strings
PriorityBlockingQueue<String> names
= new PriorityBlockingQueue<String>();
// Add string
names.add("Geeks");
names.add("forGeeks");
names.add("A computer portal");
// print list of names
System.out.println(names);
// Apply take() method
String head = names.take();
// Print head of queue using take() method
System.out.println("Head of Queue: "
+ head);
System.out.print("After removing head, Queue: "
+ names);
}
}
的优先级阻塞队列的 take()方法输出:
[A computer portal, forGeeks, Geeks]
Head of Queue: A computer portal
After removing head, Queue: [Geeks, forGeeks]
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