Deque pushes vs polls

import java.util.ArrayDeque;
import java.util.Deque;

public class Main {
    public static void main(String[] args) {
        Deque<String> queue = new ArrayDeque<>();
        queue.add("A");
        queue.addFirst("B");
        queue.offerLast("C");
        queue.pollFirst();
        queue.push("D");

        System.out.println(queue.pop());
        System.out.println(queue.removeLast());
        System.out.println(queue.peek());
    }
}