DelayQueue iterator() method in Java with Examples

// 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());  }  } }