ConcurrentLinkedDeque iterator() method in Java with Example

Last Updated : 24 Dec, 2018
The Java.util.concurrent.ConcurrentLinkedDeque.iterator() method is used to return an iterator of the same elements as that of the ConcurrentLinkedDeque. The elements are returned in random order from what was present in the deque. Syntax: 
Iterator iterate_value = ConcurrentLinkedDeque.iterator();
Parameters: The function does not take any parameter. Return Value: The method iterates over the elements of the deque and returns the values(iterators). Below program illustrates the use of Java.util.concurrent.ConcurrentLinkedDeque.iterator() method: Example 1: Java 
// Java code to illustrate iterator()

import java.util.concurrent.*;
import java.util.*;

public class ConcurrentLinkedDequeDemo {
    public static void main(String args[])
    {
        // Creating an empty ConcurrentLinkedDeque
        ConcurrentLinkedDeque<String> deque
            = new ConcurrentLinkedDeque<String>();

        // Use add() method to add elements
        // into the ConcurrentLinkedDeque
        deque.add("Welcome");
        deque.add("To");
        deque.add("Geeks");
        deque.add("4");
        deque.add("Geeks");

        // Displaying the ConcurrentLinkedDeque
        System.out.println("ConcurrentLinkedDeque: "
                           + deque);

        // Creating an iterator
        Iterator value = deque.iterator();

        // Displaying the values
        // after iterating through the deque
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}
Output: 
ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks]
The iterator values are: 
Welcome
To
Geeks
4
Geeks
Example 2: ConcurrentLinkedDeque with integer elements. Java 
// Java code to illustrate iterator()

import java.util.concurrent.*;
import java.util.*;

public class ConcurrentLinkedDequeDemo {
    public static void main(String args[])
    {
        // Creating an empty ConcurrentLinkedDeque
        ConcurrentLinkedDeque<Integer> deque
            = new ConcurrentLinkedDeque<Integer>();

        // Use add() method
        // to add elements into the ConcurrentLinkedDeque
        deque.add(10);
        deque.add(20);
        deque.add(30);
        deque.add(40);
        deque.add(50);

        // Displaying the ConcurrentLinkedDeque
        System.out.println("ConcurrentLinkedDeque: "
                           + deque);

        // Creating an iterator
        Iterator value = deque.iterator();

        // Displaying the values
        // after iterating through the deque
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}
Output: 
ConcurrentLinkedDeque: [10, 20, 30, 40, 50]
The iterator values are: 
10
20
30
40
50
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