Comprehensive Solution for Implementing Classes and Inheritance in C++ Programming

Instructions

Objective

Write a C++ assignment where you are required to create a program to implement classes and inheritances in C++ language. This assignment will test your understanding of object-oriented programming concepts and your ability to design and use classes effectively. In this assignment, you will be tasked with creating a hierarchy of classes that demonstrate inheritance, encapsulation, and polymorphism. Make sure to carefully plan your class structure and use appropriate access specifiers to showcase the principles of object-oriented programming.

Requirements and Specifications

Source Code

import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.List; import java.util.Scanner; import java.util.stream.Collectors; public class Hospital { private static final String DEFAULT_FILENAME = "Employee.txt"; private final String filename; private final List employees; public Hospital(String filename) throws IOException { this.filename = filename; try(Scanner scanner = new Scanner(new File(filename))) { employees = new ArrayList<>(); while(scanner.hasNextLine()) { String[] parts = scanner.nextLine().split("\\s+"); String name = parts[1]; int blazerId = Integer.parseInt(parts[2]); String role = parts[0]; switch (role) { case "E": addEmployee(new HospitalEmployee(blazerId, name)); break; case "D": addEmployee(new Doctor(blazerId, name, parts[3])); break; case "N": addEmployee(new Nurse(blazerId, name, Integer.parseInt(parts[3]))); break; case "A": addEmployee(new Administrator(blazerId, name, parts[3])); break; case "S": addEmployee(new Surgeon(blazerId, name, parts[3], "Y".equalsIgnoreCase(parts[4]))); break; case "R": addEmployee(new Receptionist(blazerId, name, parts[3], "Y".equalsIgnoreCase(parts[4]))); break; case "J": addEmployee(new Janitor(blazerId, name, parts[3], "Y".equalsIgnoreCase(parts[4]))); break; default: throw new IllegalArgumentException(); } } } } public void addEmployee(Employee employee) { employees.add(employee); } public boolean removeEmployee(int blazerId, String role) { Employee employee = employees.stream().filter(e -> e.getBlazerId() == blazerId && e.getRole().equals(role)).findAny().orElse(null); if (employee == null) { return false; } employees.remove(employee); return true; } public void displayList() { System.out.println("The UAB Hospital System has the following employees:"); System.out.println(); System.out.println("Total Number of employees = " + employees.size()); System.out.println(); List hospitalEmployees = employees.stream().filter(e -> "Hospital Employee".equals(e.getRole())).collect(Collectors.toList()); System.out.println("Hospital Employees: " + hospitalEmployees.size()); for (Employee e : hospitalEmployees) { System.out.println(e); } System.out.println(); List doctors = employees.stream().filter(e -> "Doctor".equals(e.getRole())).collect(Collectors.toList()); System.out.println("Doctors: " + doctors.size()); for (Employee e : doctors) { System.out.println(e); } System.out.println(); List surgeons = employees.stream().filter(e -> "Surgeon".equals(e.getRole())).collect(Collectors.toList()); System.out.println("Surgeons: " + surgeons.size()); for (Employee e : surgeons) { System.out.println(e); } System.out.println(); List nurses = employees.stream().filter(e -> "Nurse".equals(e.getRole())).collect(Collectors.toList()); System.out.println("Nurses: " + nurses.size()); for (Employee e : nurses) { System.out.println(e); } System.out.println(); List administrators = employees.stream().filter(e -> "Administrator".equals(e.getRole())).collect(Collectors.toList()); System.out.println("Administrators: " + administrators.size()); for (Employee e : administrators) { System.out.println(e); } System.out.println(); List receptionists = employees.stream().filter(e -> "Receptionist".equals(e.getRole())).collect(Collectors.toList()); System.out.println("Receptionists: " + receptionists.size()); for (Employee e : receptionists) { System.out.println(e); } System.out.println(); List janitors = employees.stream().filter(e -> "Janitor".equals(e.getRole())).collect(Collectors.toList()); System.out.println("Janitors: " + janitors.size()); for (Employee e : janitors) { System.out.println(e); } System.out.println(); } public void updateDatabase() throws IOException { try(PrintWriter printWriter = new PrintWriter(filename)) { for(Employee e : employees) { printWriter.println(e.toDBString()); } } System.out.println("Database updated"); } private static void printHeader() { System.out.println("**********************************"); System.out.println("Welcome to the UAB Employee System"); System.out.println("*********************************"); } private static int getChoice(Scanner scanner) { while(true) { System.out.println("Menu:"); System.out.println("1. Display the employee list"); System.out.println("2. Add employee"); System.out.println("3. Update the database"); System.out.println("4. Remove the employee"); System.out.println("5. Exit"); System.out.print("Your choice: "); try { int choice = Integer.parseInt(scanner.nextLine()); if (choice < 0 || choice > 5) { throw new IllegalArgumentException(); } return choice; } catch (Exception e) { System.out.println("Invalid input"); } System.out.println(); } } public static void main(String[] args) throws IOException { Hospital hospital = new Hospital(DEFAULT_FILENAME); try(Scanner scanner = new Scanner(System.in)) { printHeader(); boolean isOver = false; while(!isOver) { int choice = getChoice(scanner); switch (choice) { case 1: hospital.displayList(); break; case 2: try { System.out.print("Please, enter blazer ID: "); int blazerId = Integer.parseInt(scanner.nextLine().trim()); System.out.print("Please, enter name: "); String name = scanner.nextLine().trim(); System.out.print("Please, enter role (E, D, N, A, S, R, J): "); String role = scanner.nextLine().trim(); switch (role) { case "E": hospital.addEmployee(new HospitalEmployee(blazerId, name)); break; case "D": System.out.print("Please, enter specialty: "); String specialty = scanner.nextLine().trim(); hospital.addEmployee(new Doctor(blazerId, name, specialty)); break; case "N": System.out.print("Please, enter number of patients: "); int patients = Integer.parseInt(scanner.nextLine().trim()); hospital.addEmployee(new Nurse(blazerId, name, patients)); break; case "A": System.out.print("Please, enter department: "); String department = scanner.nextLine().trim(); hospital.addEmployee(new Administrator(blazerId, name, department)); break; case "S": System.out.print("Please, enter department: "); department = scanner.nextLine().trim(); System.out.print("Please, enter operating (Y/N): "); boolean operating = "Y".equalsIgnoreCase(scanner.nextLine().trim()); hospital.addEmployee(new Surgeon(blazerId, name, department, operating)); break; case "R": System.out.print("Please, enter department: "); department = scanner.nextLine().trim(); System.out.print("Please, enter answering (Y/N): "); boolean answering = "Y".equalsIgnoreCase(scanner.nextLine().trim()); hospital.addEmployee(new Receptionist(blazerId, name, department, answering)); break; case "J": System.out.print("Please, enter department: "); department = scanner.nextLine().trim(); System.out.print("Please, enter sweeping (Y/N): "); boolean sweeping = "Y".equalsIgnoreCase(scanner.nextLine().trim()); hospital.addEmployee(new Janitor(blazerId, name, department, sweeping)); break; default: throw new IllegalArgumentException(); } } catch (Exception e) { System.out.println("Invalid input"); } break; case 3: hospital.updateDatabase(); break; case 4: try { System.out.print("Please, enter blazer ID to delete: "); int blazerIdToDelete = Integer.parseInt(scanner.nextLine().trim()); System.out.print("Please, enter role to delete: "); String roleToDelete = scanner.nextLine().trim(); if (hospital.removeEmployee(blazerIdToDelete, roleToDelete)) { System.out.println("Employee with blazer ID " + blazerIdToDelete + " was deleted"); } else { System.out.println("Employee with given blazer ID and role not found"); } } catch (NumberFormatException e) { System.out.println("Invalid blazer ID"); } break; case 5: isOver = true; break; default: throw new IllegalStateException(); } System.out.println(); } System.out.println("******************************************************************"); } } }