Answer to Question #289199 in Java | JSP | JSF for Jak

Question

Implement an application (a system) of any abstract data type (stack, queue,

tree, graph, hashing) using Java as programming

language. Some of the examples are the following:

• Dictionary implementation using AVL Tree

• Log-book for Task Monitoring

• Queuing System for Clinics

Answer 1

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

public class Main {
    public static void main(String[] args) {
        Queue<String> queue = new LinkedList<>();
        Scanner in = new Scanner(System.in);
        while (true) {
            System.out.println("1. Add a patient to the queue.");
            System.out.println("2. Remove a patient from the queue.");
            System.out.println("0. Exit.");
            switch (in.nextLine()) {
                case "1":
                    System.out.println("Enter the patient's name: ");
                    queue.offer(in.nextLine());
                    break;
                case "2":
                    if (queue.isEmpty()) {
                        System.out.println("The queue is empty.");
                    } else {
                        System.out.println("Patient: " + queue.poll());
                    }
                    break;
                case "0":
                    System.exit(0);
            }
        }
    }
}