In a queue implemented with ArrayDeque, what will the following code output? ArrayDeque queue = new ArrayDeque<>(); queue.offer(1); queue.offer(2); queue.offer(3); System.out.println(queue.poll());?

Collections · interview question

In a queue implemented with ArrayDeque, what will the following code output? ArrayDeque<Integer> queue = new ArrayDeque<>(); queue.offer(1); queue.offer(2); queue.offer(3); System.out.println(queue.poll());?

Multiple choiceMediumchapter-4-curatedpremiumcollectionsqueue-and-deque-basics

java

ArrayDeque<Integer> queue = new ArrayDeque<>();
queue.offer(1);
queue.offer(2);
queue.offer(3);
System.out.println(queue.poll());

132Null

Answer and explanation

A. 1

The poll() method retrieves and removes the head of the queue, which is the first element added. Thus, it will output '1'.

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