What is the Deque.pollLast() method in Java?

In this shot, we will discuss how to use the Deque.pollLast() method, which is present in the Deque interface inside the java.util package.

The Deque.pollLast() method of Deque is used to retrieve and remove the last element of the given deque. If the given deque is empty, then this method will return null.

Syntax

Deque.PollLast();

Parameter

The Deque.pollLast() method does not take any parameter.

Return value

The Deque.pollLast() method returns the last element of the deque. It returns null if the deque is empty.

Code

Let’s illustrate the use of the Deque.pollLast() method with the help of the code snippet below.

import java.util.*;
class Solution {
    public static void main(String[] args) {
        Deque<Integer> dq= new ArrayDeque<>();
        dq.add(10);
        dq.add(20);
        dq.add(30);
        dq.add(40);
        dq.add(50);
        System.out.println("the elements of deque are:-\n"+dq);
        int ele= dq.pollLast();
        System.out.println("first element of deque is:-\n"+ ele);
        System.out.println("deque after pollLast operation is:-\n"+ dq);
    }
}

Explanation

  • In line 1, we imported the java.util.* package to include the Deque interface.
  • In lines 7 to 17, we initialized the object of the deque of type Integer and added elements 10,20,30,40,and 50 in that.
  • In line 19, we printed the elements of the deque.
  • In line 21, we used the method deque.pollLast() and stored the returned element in the ele variable.
  • In the line 23, we printed the last element of deque.
  • In line 25, we printed the deque after using the pollLast() method.

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