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ArrayDeque descendingIterator() Method in Java

Last Updated : 10 Dec, 2018
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The Java.util.ArrayDeque.descendingIterator() method is used to return an iterator of the same elements as the ArrayDeque 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.ArrayDeque.descendingIterator() method: Program 1: Java 
// Java code to illustrate descendingIterator() import java.util.*; public class ArrayDequeDemo {  public static void main(String args[])  {  // Creating an empty ArrayDeque  Deque<String> de_que = new ArrayDeque<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 ArrayDeque  System.out.println("ArrayDeque: " + de_que);  // Creating a desc_iterator  Iterator value = de_que.descendingIterator();  // Displaying the values after iterating through the Deque  // in reverse order  System.out.println("The iterator values are: ");  while (value.hasNext()) {  System.out.println(value.next());  }  } }
Output: 
 ArrayDeque: [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.*; public class ArrayDequeDemo {  public static void main(String args[])  {  // Creating an empty ArrayDeque  Deque<Integer> de_que = new ArrayDeque<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 ArrayDeque  System.out.println("ArrayDeque: " + de_que);  // Creating a desc_iterator  Iterator value = de_que.descendingIterator();  // Displaying the values after iterating through the Deque  // in reverse order  System.out.println("The iterator values are: ");  while (value.hasNext()) {  System.out.println(value.next());  }  } }
Output: 
 ArrayDeque: [10, 15, 30, 20, 5] The iterator values are: 5 20 30 15 10

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