ArrayBlockingQueue put() 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 put (E e) method inserts element passed as parameter to method at the tail of this queue(ArrayBlockingQueue) if queue is not full. If the queue is full then it will wait for space to become available.
Syntax:

public void put(E e)  throws InterruptedException

Parameter:
e – the element to add in queue.
Throws
InterruptedException – if interrupted while waiting.
NullPointerException – if the specified element is null.



Below programs illustrate put(E e) method of ArrayBlockingQueue.

Example 1

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// Java Program to demonstrate put(E e)
// 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);
        queue.put(357);
        queue.put(964);
  
        // print Queue
        System.out.println("queue contains " + queue);
    }
}

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Output :
queue contains [223, 546, 986, 357, 964]

Example 2

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// Java Program to demonstrate put(E e)
// 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 some elements
        queue.remove();
        queue.remove();
  
        // Add elements to ArrayBlockingQueue using put method
        queue.put("CaptainAmerica");
        queue.put("Thor");
  
        System.out.println("queue contains " + queue);
    }
}

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Output :
queue contains [StarWars, SuperMan, Flash, BatMan, Avengers]
queue contains [Flash, BatMan, Avengers, CaptainAmerica, Thor]

Reference:
https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ArrayBlockingQueue.html#put(E)



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