ArrayBlockingQueue remove() method in Java

Last Updated : 26 Nov, 2018

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

Java

// 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);     } }

  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

Java

// 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);     } }

  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)