Program To Implement Classes and Inheritances in C++ Assignment Solution
- Instructions
- Requirements and Specifications
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("******************************************************************");
}
}
}
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