Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question

Draw a UML class diagram for the following code:

import java.util.*;

public class QueueOperationsDemo {
    public static void main(String[] args) {
        Queue<String> linkedListQueue = new LinkedList<>();
        linkedListQueue.add("Apple");
        linkedListQueue.add("Banana");
        linkedListQueue.add("Cherry");

        System.out.println("Is linkedListQueue empty? " + linkedListQueue.isEmpty());

        System.out.println("Front element: " + linkedListQueue.peek());
        System.out.println("Removed element: " + linkedListQueue.remove());
        System.out.println("Front element after removal: " + linkedListQueue.peek());
        Queue<Integer> arrayDequeQueue = new ArrayDeque<>();
        arrayDequeQueue.add(10);
        arrayDequeQueue.add(20);
        arrayDequeQueue.add(30);

        System.out.println("Is arrayDequeQueue empty? " + arrayDequeQueue.isEmpty());

        System.out.println("Front element: " + arrayDequeQueue.peek());
        System.out.println("Removed element: " + arrayDequeQueue.remove());
        System.out.println("Front element after removal: " + arrayDequeQueue.peek());
        Queue<Double> priorityQueue = new PriorityQueue<>();
        priorityQueue.add(5.5);
        priorityQueue.add(3.3);
        priorityQueue.add(7.7);

        System.out.println("Is priorityQueue empty? " + priorityQueue.isEmpty());

        System.out.println("Front element: " + priorityQueue.peek());
        System.out.println("Removed element: " + priorityQueue.remove());
        System.out.println("Front element after removal: " + priorityQueue.peek());
}

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