Java Deque descendingIterator() Method with Examples

by Online Tutorials Library July 22, 2022

Java Deque descendingIterator() Method

The descendingIterator() method of Java Deque Interface returns an iterator for the elements in the specified deque in a reverse sequence. The elements will return in a sequential order from first(head) to the last(tail).

Syntax:

Parameter:

Return:

The above method returns an iterator for the elements in the specified deque in a reverse sequence.

Example 1

  import java.util.ArrayDeque;  import java.util.Deque;  import java.util.Iterator;  public class JavaDequedescendingIteratorExample1 {     public static void main(String[] args) {  Deque<Integer> deque = new ArrayDeque<>();  System.out.println(“The list of numbers before using descendingIterator : “);   deque.add(32);   deque.add(21);   deque.add(20);   deque.add(17);   deque.add(89);   for (Integer integer : deque) {  System.out.println(integer);  }   System.out.println(“The list of numbers after using descendingIterator :”);  Iterator<Integer>  iterator= deque.descendingIterator();  while(iterator.hasNext()) {  System.out.println(iterator.next());  }     }  }  

Test it Now

Output:

The list of numbers before using descendingIterator :   32  21  20  17  89  The list of numbers after using descendingIterator :  89  17  20  21  32

Example 2

  import java.util.ArrayDeque;  import java.util.Deque;  import java.util.Iterator;  public class JavaDequedescendingIteratorExample2 {     public static void main(String[] args) {       Deque<Float> deque = new ArrayDeque<>();  System.out.println(“The list of numbers before using descendingIterator : “);   deque.add(20f);   deque.add(11f);   deque.add(66f);   deque.add(89f);   deque.add(77f);   for (Float integer : deque) {  System.out.println(integer);  }  System.out.println(“The list of numbers after using descendingIterator :”);  Iterator<Float>  iterator= deque.descendingIterator();  while(iterator.hasNext()) {  System.out.println(iterator.next());  }     }  }  

Test it Now

Output:

The list of numbers before using descendingIterator :   20.0  11.0  66.0  89.0  77.0  The list of numbers after using descendingIterator :  77.0  89.0  66.0  11.0  20.0

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