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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