What is the operation to remove an element from the Queue?

Java MCQ: What is the operation to remove an element from the Queue?

Answer:

Explanation:

The operation used to remove an element from a queue is called “dequeue.” The dequeue operation removes the element from the front of the queue, which is the first element that was added, following the FIFO (First In First Out) principle. This operation ensures that elements are processed in the order they were enqueued.

In contrast, the push and pop operations are associated with stacks, where elements are added to and removed from the top of the stack, respectively. The enqueue operation is used to add elements to the rear of the queue.

Here’s an example of the dequeue operation in Java:

import java.util.LinkedList;
import java.util.Queue;

public class Main {
    public static void main(String[] args) {
        Queue<Integer> queue = new LinkedList<>();
        queue.add(10);
        queue.add(20);
        queue.add(30);
        int frontElement = queue.remove(); // Dequeue operation
        System.out.println(frontElement); // Outputs: 10
        System.out.println(queue); // Outputs: [20, 30]
    }
}

In this example, the number 10, which was the first element enqueued, is dequeued, leaving 20 and 30 in the queue. The dequeue operation is crucial in scenarios where the order of processing elements must be preserved, such as in task scheduling, request handling, and print queue management.

Reference links:

https://www.javaguides.net/p/java-queue-tutorial.html