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DelayQueue size() method in Java with Examples
  • Last Updated : 23 Dec, 2018

The size() method of DelayQueue class in Java is used to return the number of elements present in the given queue. If the number of elements is greater than Integer.MAX_VALUE then Integer.MAX_VALUE is returned as the size of this DelayQueue.

Syntax:

public int size()

Parameters: It does not takes in any parameter.

Return Value: It returns an integer which is the length of the queue.

Below program illustrate the size() method of DelayQueue in Java:




// Java program to illutrate 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());
    }
}


Output:

Size : 1

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