ArrayBlockingQueue remove() method in Java

ArrayBlockingQueue is bounded, blocking queue that stores the elements internally backed by an array.

  • ArrayBlockingQueue class is a member of the Java Collections Framework.
  • Bounded means it will have a fixed size, you can not store number the elements more than the capacity of the queue.
  • The queue also follows FIFO (first-in-first-out) rule for storing and removing elements from the queue.
  • If you try to put an element into a full queue or to take an element from an empty queue then the queue will block you.

The remove(Object o) method removes a single instance of the specified element from this queue, if it is present.
We can say that method removes an element e such that o.equals(e) if this queue contains one or more such elements. Remove() method returns true if this queue contained the specified element which we want to remove.

Syntax:



public boolean remove(Object o)

Parameter:
o – element to be removed from this queue, if present.
Returns:
returns true if this queue contained the specified element which we want to remove.

Below program illustrate remove(Object o) method of ArrayBlockingQueue.

Example 1

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// Java Program Demonstrate remove(Object o)
// method of ArrayBlockingQueue.
import java.util.concurrent.ArrayBlockingQueue;
  
public class GFG {
  
    public static void main(String[] args) throws InterruptedException
    {
        // define capacity of ArrayBlockingQueue
        int capacity = 5;
  
        // create object of ArrayBlockingQueue
        ArrayBlockingQueue<Integer> queue
            = new ArrayBlockingQueue<Integer>(capacity);
  
        // Add elements to ArrayBlockingQueue using put method
        queue.put(223);
        queue.put(546);
        queue.put(986);
  
        // print Queue
        System.out.println("queue contains " + queue);
  
        // remove 223
        boolean response = queue.remove(223);
        // print Queue
        System.out.println("Removal of 223 :" + response);
  
        // print Queue
        System.out.println("queue contains " + queue);
  
        // remove 546
        response = queue.remove(546);
        // print Queue
        System.out.println("Removal of 546 :" + response);
  
        // print Queue
        System.out.println("queue contains " + queue);
  
        // remove 734 which is not present
        response = queue.remove(734);
        // print Queue
        System.out.println("Removal of 734 :" + response);
  
        // print Queue
        System.out.println("queue contains " + queue);
    }
}

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Output :
queue contains [223, 546, 986]
Removal of 223 :true
queue contains [546, 986]
Removal of 546 :true
queue contains [986]
Removal of 734 :false
queue contains [986]

Example 2

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// Java Program Demonstrate remove(Object o)
// method of ArrayBlockingQueue.
  
import java.util.concurrent.ArrayBlockingQueue;
  
public class GFG {
  
    public static void main(String[] args) throws InterruptedException
    {
        // define capacity of ArrayBlockingQueue
        int capacity = 5;
  
        // create object of ArrayBlockingQueue
        ArrayBlockingQueue<String> queue
            = new ArrayBlockingQueue<String>(capacity);
  
        // Add elements to ArrayBlockingQueue using put method
        queue.put("StarWars");
        queue.put("SuperMan");
        queue.put("Flash");
        queue.put("BatMan");
        queue.put("Avengers");
  
        // print Queue
        System.out.println("queue contains " + queue);
  
        // remove StarWars
        boolean response = queue.remove("StarWars");
        // print Queue
        System.out.println("Removal of StarWars :" + response);
  
        // print Queue
        System.out.println("queue contains " + queue);
  
        // remove Hulk
        response = queue.remove("Hulk");
        // print Queue
        System.out.println("Removal of Hulk :" + response);
  
        // print Queue
        System.out.println("queue contains " + queue);
    }
}

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Output :
queue contains [StarWars, SuperMan, Flash, BatMan, Avengers]
Removal of StarWars :true
queue contains [SuperMan, Flash, BatMan, Avengers]
Removal of Hulk :false
queue contains [SuperMan, Flash, BatMan, Avengers]

Reference:
https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ArrayBlockingQueue.html#remove(java.lang.Object)



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