Java.util.ArrayDeque.descendingIterator() Method

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Description

The java.util.ArrayDeque.descendingIterator() method returns an iterator over the elements in this deque in reverse sequential order.

Declaration

Following is the declaration for java.util.ArrayDeque.descendingIterator() method

public Iterator<E> descendingIterator()

Parameters

  • NA

Return Value

This method returns an iterator over the elements in this deque in reverse sequence.

Exception

  • NA

Example

The following example shows the usage of java.util.ArrayDeque.descendingIterator() method.

package com.tutorialspoint;

import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Iterator;

public class ArrayDequeDemo {
   public static void main(String[] args) {
      
     // create an empty array deque with an initial capacity
     Deque<Integer> deque = new ArrayDeque<Integer>(8);

     // use add() method to add elements in the deque
     deque.add(15);
     deque.add(22);
     deque.add(25);
     deque.add(20);

     //iterator() is used to print all the elements
     //next() returns the next element on each iteration
     System.out.println("printing elements using iterator:");
	 
     for(Iterator itr = deque.iterator();itr.hasNext();)  {
        System.out.println(itr.next());
     }

     //descendingIterator() is used to print the elements in reverse order
     //next() returns the next element on each iteration
     System.out.println("printing elements in reverse order:");
	 
     for(Iterator descItr = deque.descendingIterator();descItr.hasNext();) {
        System.out.println(descItr.next());
     }
   }
 }  

Let us compile and run the above program, this will produce the following result:

printing elements using iterator:
15
22
25
20
printing elements in reverse order:
20
25
22
15
 



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