DelayQueue remove() method in Java

The remove() method of DelayQueue class in Java is used to remove a single instance of the given object say obj from this DelayQueue if it is present. It returns true if the given element is removed successfully otherwise it returns false.

Syntax:

public boolean remove(Object obj)

Parameters: This method takes a single object obj as parameter which is to be removed from this DealyQueue.

Return Value: It returns a boolean value which is true if the element has been successfully deleted otherwise it returns false.

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

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// 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());
    }
}

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Output:

Initial Size : 1
Size after removing : 0


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