Which operation is used to add an element in the Queue?

Java MCQ: Which operation is used to add an element in the Queue?

Answer:

Explanation:

The operation used to add an element to a queue is called “enqueue.” The enqueue operation adds an element to the rear (or end) of the queue, following the FIFO (First In First Out) principle. This ensures that elements are added in the order they arrive and will be processed in the same order.

In contrast, the push operation is associated with stacks, where elements are added to the top of the stack, and the pop operation removes elements from the top of the stack. The dequeue operation, on the other hand, is used to remove an element from the front of the queue, which is the first element that was added.

Here’s an example of enqueue 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); // Enqueue operation
        queue.add(20);
        queue.add(30);
        System.out.println(queue); // Outputs: [10, 20, 30]
    }
}

In this example, the numbers 10, 20, and 30 are enqueued into the queue in that order. The queue maintains the order of these elements, ensuring that they will be dequeued in the same sequence. Understanding the enqueue operation is essential for implementing and managing queues effectively in various applications, such as task scheduling, data buffering, and breadth-first search (BFS) algorithms.

Reference links:

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