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ConcurrentLinkedDeque descendingIterator() method in Java with Example

Last Updated : 24 Dec, 2018
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The Java.util.concurrent.ConcurrentLinkedDeque.descendingIterator() method is used to return an iterator of the same elements as the ConcurrentLinkedDeque but in the reverse order. Syntax: 
Iterator iterate_value = Array_Deque.descendingIterator();
Parameters: The method does not take any parameter. Return Value: The method iterates over the elements of the deque and returns the values(iterators) in reverse order. Below programs illustrate the Java.util.concurrent.ConcurrentLinkedDeque.descendingIterator() method: Program 1: Java 
// Java code to illustrate descendingIterator()

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

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

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

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

        // Creating a desc_iterator
        Iterator value = de_que.descendingIterator();

        // Displaying the values after iterating
        // through the ConcurrentLinkedDeque
        // in reverse order
        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: 
Geeks
4
Geeks
To
Welcome
Program 2: Java 
// Java code to illustrate descendingIterator()

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

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

        // Use add() method to add elements into the Queue
        de_que.add(10);
        de_que.add(15);
        de_que.add(30);
        de_que.add(20);
        de_que.add(5);

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

        // Creating a desc_iterator
        Iterator value = de_que.descendingIterator();

        // Displaying the values after iterating
        // through the ConcurrentLinkedDeque
        // in reverse order
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}
Output: 
ConcurrentLinkedDeque: [10, 15, 30, 20, 5]
The iterator values are: 
5
20
30
15
10

M
MerlynShelley
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