Java MCQ: Is a Queue a dynamic data structure?
Answer:
Explanation:
Yes, a queue is a dynamic data structure because its size can change during the execution of a program. Unlike static data structures, where the size is fixed at compile-time, a dynamic queue can grow or shrink as elements are enqueued or dequeued. This flexibility makes queues ideal for situations where the number of elements is not known in advance and can vary during the program’s runtime.
In Java, queues are often implemented using linked lists or dynamic arrays, both of which allow the structure to expand or contract as needed. For example, in a linked list-based queue, each element is a node that points to the next element, allowing the queue to grow indefinitely as long as there is available memory.
Here’s an example of a dynamic queue in Java using a linked list:
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.remove(); // Dequeue operation
System.out.println(queue); // Outputs: [20]
}
}
In this example, the queue grows when elements are enqueued and shrinks when elements are dequeued, demonstrating its dynamic nature. This dynamic behavior is essential for applications like task scheduling, where the number of tasks can vary over time, requiring a flexible data structure to manage them efficiently.