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DelayQueue size() method in Java with Examples

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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.

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 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) >
                    return 1;
                else if (o.getDelay(TimeUnit.DAYS) ==
                    return 0;
                return -1;
        // Insert the object to this DelayQueue
        // Size of the queue after insertion will be 1
        // print the size of this DelayQueue using
        // size() method
        System.out.println("Size : " + queue.size());


Size : 1


Last Updated : 06 Jul, 2021
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