DelayQueue size() method in Java with Examples

// Java program to illustrate the size() 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 obj = 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;
            }
        };

        // Insert the object to this DelayQueue
        // Size of the queue after insertion will be 1
        queue.add(obj);

        // print the size of this DelayQueue using
        // size() method
        System.out.println("Size : " + queue.size());
    }
}