PriorityBlockingQueue的take()方法在删除队列后将其返回。如果queue为空,则此方法将等待直到元素可用。
用法:
public E take() throws InterruptedException
返回值:此方法返回此PriorityBlockingQueue开头的值。
异常:如果在等待元素可用时被中断,则此方法将引发InterruptedException。
下面的程序说明PriorityBlockingQueue的take()方法:
示例1:演示PriorityBlockingQueue上的take()方法,该方法包含数字列表。
// 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:在包含字符串的PriorityBlockingQueue上演示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
// 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);
}
}
输出:
[A computer portal, forGeeks, Geeks] Head of Queue: A computer portal After removing head, Queue: [Geeks, forGeeks]
参考: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/PriorityBlockingQueue.html#take–
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