DelayQueue的take()方法用于检索DelayQueue的头部，也将其删除。因此，减小了DelayQueue的大小。如果此队列上有延迟过期的元素可用，则此函数等待。

用法:

public E take ()

参数：此方法不接受任何参数。

返回值：该函数返回DelayQueue的头部。

异常：如果在等待期间被中断，则此方法将引发InterruptedException。

以下示例程序旨在说明DelayQueue.take()方法：

程序：

// Java Program Demonstrate DelayQueue take() method

import java.util.concurrent.*;

import java.util.*;

// The DelayObject for DelayQueue

// It must implement Delayed and

// its getDelay() and compareTo() method

class DelayObject implements Delayed {

private String name;

private long time;

// Contructor of DelayObject

public DelayObject(String name, long delayTime)

{

this.name = name;

this.time = System.currentTimeMillis()

+ delayTime;

}

// Implementing getDelay() method of Delayed

@Override

public long getDelay(TimeUnit unit)

{

long diff = time - System.currentTimeMillis();

return unit.convert(diff, TimeUnit.MILLISECONDS);

}

// Implementing compareTo() method of Delayed

@Override

public int compareTo(Delayed obj)

{

if (this.time < ((DelayObject)obj).time) {

return -1;

}

if (this.time > ((DelayObject)obj).time) {

return 1;

}

return 0;

}

// Implementing toString() method of Delayed

@Override

public String toString()

{

return "\n{"

+ " " + name + ", time=" + time + "}";

}

}

// Driver Class

public class GFG {

public static void main(String[] args) throws InterruptedException

{

// create object of DelayQueue

// using DelayQueue() constructor

BlockingQueue DQ

= new DelayQueue();

// Add numbers to end of DelayQueue

// using add() method

DQ.add(new DelayObject("A", 1));

DQ.add(new DelayObject("B", 2));

DQ.add(new DelayObject("C", 3));

DQ.add(new DelayObject("D", 4));

// print the size of DelayQueue

System.out.println("Size of the DelayQueue: "

+ DQ.size());

// print queue

System.out.println("DelayQueue: "

+ DQ);

// take() function will retrieve and remove the head of DelayQueue

System.out.println("Head of the DelayQueue:"

+ DQ.take());

// print the size of DelayQueue

System.out.println("Size of the DelayQueue: "

+ DQ.size());

// print queue

System.out.println("DelayQueue: "

+ DQ);

}

}

输出：

Size of the DelayQueue: 4

DelayQueue: [

{ A, time=1546842594283},

{ B, time=1546842594284},

{ C, time=1546842594285},

{ D, time=1546842594286}]

Head of the DelayQueue:

{ A, time=1546842594283}

Size of the DelayQueue: 3

DelayQueue: [

{ B, time=1546842594284},

{ D, time=1546842594286},

{ C, time=1546842594285}]