Added basic registerUser Method to Administration Class

src/main/java/org/example/Administration.java

@@ -2,6 +2,7 @@ package org.example;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Scanner;
 
 public class Administration {
     /**
@@ -10,6 +11,7 @@ public class Administration {
     private List<Professor> professors;
     private List<Admin> admins;
     private List<Student> students;
+    Scanner scanner = new Scanner(System.in);
 
     /**
      *  Constructor
@@ -158,6 +160,54 @@ public class Administration {
         return null;
     }
 
+    public void registerUser()
+    {
+        String UserId = null;
+        String UserName = null;
+
+        System.out.println("Enter the type of user (1-Student, 2-Admin, 3-Professor): ");
+        int userType = scanner.nextInt();
+
+
+        boolean correctData = false;
+        while(!correctData)
+        {
+            System.out.println("Enter the User Details!");
+            System.out.println("Name: ");
+            UserName = scanner.next();
+            System.out.println("ID: ");
+            UserId = scanner.next();
+
+            if(findProfessorById(UserId) != null || findAdminById(UserId) != null || findStudentById(UserId) != null)
+            {
+                System.out.println("Please enter an ID which is not being used!");
+                correctData = false;
+            }
+            else if(findProfessorById(UserId) == null || findAdminById(UserId) == null || findStudentById(UserId) == null)
+            {
+                System.out.println("The Id has not been used already!");
+                correctData = true;
+            }
+
+            switch (userType)
+            {
+                case 1:
+                    Student student = new Student(UserName, UserId, "Student");
+                    addStudents(student);
+                    break;
+                case 2:
+                    Admin admin = new Admin(UserName, UserId, "Admin");
+                    addAdmin(admin);
+                    break;
+                case 3:
+                    Professor professor = new Professor(UserId, UserName, "Professor");
+                    addProfessor(professor);
+                default:
+                    break;
+            }
+        }
+    }
+
 }