DelayQueue remove() method in Java

// Java Program to illustrate the remove method
// of DelayQueue class

import java.util.concurrent.DelayQueue;
import java.util.concurrent.Delayed;
import java.util.concurrent.TimeUnit;

public class GFG {
    public static void main(String args[])
    {
        // Create a DelayQueue instance
        DelayQueue<Delayed> queue = new DelayQueue<Delayed>();

        // Create an object of type Delayed
        Delayed ob = new Delayed() {
            public long getDelay(TimeUnit unit)
            {
                return 24; // some value is returned
            }

            public int compareTo(Delayed o)
            {
                if (o.getDelay(TimeUnit.DAYS) > 
                                 this.getDelay(TimeUnit.DAYS))
                    return 1;
                else if (o.getDelay(TimeUnit.DAYS) == 
                                 this.getDelay(TimeUnit.DAYS))
                    return 0;
                return -1;
            }
        };

        // Add the object to DelayQueue
        queue.add(ob);

        // Print initial size of Queue
        System.out.println("Initial Size : "
                           + queue.size());

        // Remove the object ob from
        // this DelayQueue
        queue.remove(ob);

        // Print the final size of the DelayQueue
        System.out.println("Size after removing : "
                           + queue.size());
    }
}