Java ArrayDeque Class: descendingIterator() Method

public Iterator<E> descendingIterator()

The descendingIterator() method is used to iterator over the elements in a given deque in reverse sequential order. The elements return in order from last (tail) to first (head).

Package: java.util

Java Platform: Java SE 8

Syntax:

descendingIterator()

Return Value:

An iterator over the elements in this deque in reverse sequence

Return Value Type: Iterator<E - the type of elements held in this collection>

Pictorial Presentation

Example: Java ArrayDeque Class: descendingIterator() Method

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

public class Main {
   public static void main(String[] args) {
   Deque<Integer> deque = new ArrayDeque<Integer>(8);
   
    // use add() method to add elements in the deque
      deque.add(10);
      deque.add(20);
      deque.add(30);
      deque.add(40);

      
      System.out.println("Print all the elements of the original deque:");
       
      for(Iterator itr = deque.iterator(); itr.hasNext();)  {
         System.out.println(itr.next());
      }

       System.out.println("Print all the elements of the original deque in reverse order:");
       
      for(Iterator desc_itrr = deque.descendingIterator();desc_itrr.hasNext();) {
         System.out.println(desc_itrr.next());
      }
   }
 }
 

Output:

Print all the elements of the original deque:
10
20
30
40
Print all the elements of the original deque in reverse order:
40
30
20
10

Java Code Editor:

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