Java 中的 DelayQueue 迭代器()方法，带示例
原文:https://www . geeksforgeeks . org/delay queue-iterator-method-in-Java-with-examples/
DelayQueue 的迭代器()方法用于返回 DelayQueue 中所有元素的迭代器。这些元素可以过期或未过期。 语法:
public Iterator iterator ()
参数:此方法不接受任何参数。 返回:这个方法返回这个延迟队列中元素的迭代器。 下面程序来说明 Java 中的 DelayQueue 迭代器(): 示例:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program Demonstrate DelayQueue iterator() 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;
// Constructor 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));
// Creating an iterator
Iterator val = DQ.iterator();
// print the value after iterating DelayQueue
System.out.println("The iterator values are: ");
while (val.hasNext()) {
System.out.println(val.next());
}
}
}
Output:
The iterator values are:
{ A, time=1545818784540}
{ B, time=1545818784541}
{ C, time=1545818784542}
{ D, time=1545818784543}
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