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<DelayObject> DQ
= new DelayQueue<DelayObject>();
// 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}]
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注:本文由纯净天空筛选整理自ProgrammerAnvesh大神的英文原创作品 DelayQueue take() method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。