Question

How to iterate over deque backward in Java

Answer 1

import java.util.ArrayDeque;
import java.util.Iterator;
import java.util.Deque;
 
public class MyClass
{
    public static void main(String[] args)
    {
        Deque<Integer> deque = new ArrayDeque<Integer>();
  
        deque.push(5);
        deque.push(1);
        deque.push(9);
        deque.push(4);
  
        Iterator<Integer> itr = deque.descendingIterator();
 
        while (itr.hasNext()) {
            System.out.println(itr.next());
        }
    }
}
 
 
 
 
/*
run:
 
5
1
9
4

*/

 

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Answer 2

import java.util.ArrayDeque;
import java.util.Iterator;
import java.util.Deque;
 
public class MyClass
{
    public static void main(String[] args)
    {
        Deque<Integer> deque = new ArrayDeque<Integer>();
  
        deque.push(5);
        deque.push(1);
        deque.push(9);
        deque.push(4);
  
        deque.descendingIterator().forEachRemaining(System.out::println);
    }
}
 
 
 
 
/*
run:
 
5
1
9
4

*/

 

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