ArrayBlockingQueue iterator() Method in Java

The iterator() method of ArrayBlockingQueue class is used to returns an iterator of the same elements as this queue in a proper sequence. The elements returned from this method contains elements in order from first(head) to last(tail). The returned iterator is weakly consistent.

Syntax:

public Iterator iterator()

Return Value: The method returns the iterator having same elements as present in ArrayBlockingQueue in proper sequence.

Below programs illustrates iterator() method of ArrayBlockingQueue class:

Program 1:

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// Program Demonstrate how to apply iterator() method
// of ArrayBlockingQueue Class.
  
import java.util.concurrent.ArrayBlockingQueue;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
        // Define capacity of ArrayBlockingQueue
        int capacity = 5;
  
        // Create object of ArrayBlockingQueue
        ArrayBlockingQueue<Integer> queue = new 
                ArrayBlockingQueue<Integer>(capacity);
  
        // Add 5 elements to ArrayBlockingQueue
        queue.offer(423);
        queue.offer(422);
        queue.offer(421);
        queue.offer(420);
        queue.offer(424);
  
        // Print queue
        System.out.println("Queue is " + queue);
  
        // Call iterator() method and Create an iterator
        Iterator iteratorValues = queue.iterator();
  
        // Print elements of iterator
        System.out.println("\nThe iterator values:");
        while (iteratorValues.hasNext()) {
            System.out.println(iteratorValues.next());
        }
    }
}

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Output:


Queue is [423, 422, 421, 420, 424]

The iterator values:
423
422
421
420
424





Program 2: 











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// Program Demonstrate how to apply iterator() method 


// of ArrayBlockingQueue Class. 


  


import java.util.concurrent.ArrayBlockingQueue; 


import java.util.*; 


  


public class GFG { 


  


    public static void main(String[] args) 


    { 


        // Define capacity of ArrayBlockingQueue 


        int capacity = 5; 


  


        // Create object of ArrayBlockingQueue 


        ArrayBlockingQueue<String> queue = new 


                  ArrayBlockingQueue<String>(capacity); 


  


        // Add 5 elements to ArrayBlockingQueue 


        queue.offer("User"); 


        queue.offer("Employee"); 


        queue.offer("Manager"); 


        queue.offer("Analyst"); 


        queue.offer("HR"); 


  


        // Print queue 


        System.out.println("Queue is " + queue); 


  


        // Call iterator() method and Create an iterator 


        Iterator iteratorValues = queue.iterator(); 


  


        // Print elements of iterator 


        System.out.println("\nThe iterator values:"); 


        while (iteratorValues.hasNext()) { 


            System.out.println(iteratorValues.next()); 


        } 


    } 


} 



















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Output:


Queue is [User, Employee, Manager, Analyst, HR]

The iterator values:
User
Employee
Manager
Analyst
HR





Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ArrayBlockingQueue.html#iterator



          
          
          
          

            

    

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