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Java ArrayDeque descendingIterator() Method with Example

ArrayDeque Class descendingIterator() method: Here, we are going to learn about the descendingIterator() method of ArrayDeque Class with its syntax and example.
Submitted by Preeti Jain, on January 09, 2020

ArrayDeque Class descendingIterator() method

• descendingIterator() Method is available in java.lang package.
• descendingIterator() Method is used to return an iterator over the deque elements in descending order.
• descendingIterator() Method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• descendingIterator() Method does not throw an exception at the time of returning Iterator.

Syntax:

    public Iterator<T> descendingIterator();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is Iterator<T>, it returns an iterator over the deque elements in descending order.

Example:

// Java program to demonstrate the example 
// of Iterator<T> descendingIterator() method of ArrayDeque 

import java.util.*;

public class DescendingIteratorOfArrayDeque {
    public static void main(String[] args) {
        // Creating an ArrayDeque with initial capacity of
        // storing elements
        Deque < String > d_queue = new ArrayDeque < String > (10);

        // By using add() method to add elements
        // in Deque
        d_queue.add("C");
        d_queue.add("C++");
        d_queue.add("Java");
        d_queue.add("Php");
        d_queue.add("DotNet");

        // Display Deque Elements
        System.out.println("d_queue before descendingIterator() : ");
        System.out.println("ArrayDeque Elements = " + d_queue);


        System.out.println();

        // By using descendingIterator() method to iterate the
        // elements in descending order
        System.out.println("d_queue after descendingIterator(): ");

        // Display Deque Elements
        for (Iterator des_itr = d_queue.descendingIterator(); des_itr.hasNext();)
            System.out.println("Deque Elements : " + des_itr.next());
    }
}

Output

d_queue before descendingIterator() : 
ArrayDeque Elements = [C, C++, Java, Php, DotNet]

d_queue after descendingIterator(): 
Deque Elements : DotNet
Deque Elements : Php
Deque Elements : Java
Deque Elements : C++
Deque Elements : C