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BlockingDeque iterator() method in Java with examples

Last Updated : 12 Jul, 2025
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The iterator() method of BlockingDeque returns an iterator over the elements in this deque in a proper sequence. The elements will be returned in order from first (head) to last (tail). The returned iterator is a "weakly consistent" iterator. Syntax: 
public Iterator iterator()
Parameters: This method does not accept any parameter. Returns: This method returns an iterator over the elements in this deque in a proper sequence. Note: The iterator() method of BlockingDeque has been inherited from the LinkedBlockingDeque class in Java. Below programs illustrate iterator() method of BlockingDeque: Program 1: Java 
// Java Program Demonstrate iterator()
// method of BlockingDeque

import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;

public class GFG {
    public static void main(String[] args)

    {

        // create object of BlockingDeque
        BlockingDeque<Integer> BD
            = new LinkedBlockingDeque<Integer>();

        // Add numbers to front of BlockingDeque
        BD.addFirst(7855642);
        BD.addFirst(35658786);
        BD.addFirst(5278367);
        BD.addFirst(74381793);

        // Call iterator() method of BlockingDeque
        Iterator iteratorVals = BD.iterator();

        // Print elements of iterator
        // created from PriorityBlockingQueue
        System.out.println("The iterator values"
                           + " of BlockingDeque are:");

        // prints the elements using an iterator
        while (iteratorVals.hasNext()) {
            System.out.println(iteratorVals.next());
        }
    }
}
Output: 
The iterator values of BlockingDeque are:
74381793
5278367
35658786
7855642
Program 2: Java 
// Java Program Demonstrate iterator()
// method of BlockingDeque
// when list is of strings

import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;

public class GFG {
    public static void main(String[] args)

    {

        // create object of BlockingDeque
        BlockingDeque<String> BD
            = new LinkedBlockingDeque<String>();

        // Add numbers to front of BlockingDeque
        BD.add("Geeks");
        BD.add("forGeeks");
        BD.add("A");
        BD.add("Computer");
        BD.add("Portal");

        // Call iterator() method of BlockingDeque
        Iterator iteratorVals = BD.iterator();

        // Print elements of iterator
        // created from BlockingQueue
        System.out.println("The iterator values"
                           + " of LinkedBlockingDeque are:");

        // prints the elements using an iterator
        while (iteratorVals.hasNext()) {
            System.out.println(iteratorVals.next());
        }
    }
}
Output: 
The iterator values of BlockingDeque are:
Geeks
forGeeks
A
Computer
Portal
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#iterator()

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