Implemented Initialize Dummy Data function in Main

src/main/java/org/example/Main.java

@@ -7,7 +7,7 @@ public class Main {
         Administration administration = new Administration();
         Scanner scanner = new Scanner(System.in);
         boolean exit = false;
-
+        boolean DummyDataExists = false;
         while (!exit) {
             System.out.println("\n--- Student Management System Menu ---");
             System.out.println("1. Register Student");
@@ -47,9 +47,31 @@ public class Main {
 
                 case 7:
                     System.out.println("Dummy data initialized.");
+
+                    Student student1 = new Student("Mark", "S1001", "Student");
+                    Student student2 = new Student("Sebastian", "S1002", "Student");
+                    administration.addStudents(student1);
+                    administration.addStudents(student2);
+                    Professor prof1 = new Professor("Joachim", "P1001", "Professor");
+                    Professor prof2 = new Professor("Herbert", "P1002", "Professor");
+                    administration.addProfessor(prof1);
+                    administration.addProfessor(prof2);
+                    Admin admin1 = new Admin ("Peter", "A1001", "Admin");
+                    Admin admin2 = new Admin ("Martin", "A1002", "Admin");
+                    administration.addAdmin(admin1);
+                    administration.addAdmin(admin2);
+                    Course.addCourse("Math", "C1001", 5, "courseData.txt");
+                    Course.addCourse("English", "C1002", 6, "courseData.txt");
+
+                    DummyDataExists = true;
+
                     break;
 
                 case 8:
+                    if (DummyDataExists){
+                        Course.deleteCourse("courseData.txt");
+                        Course.deleteCourse("courseData.txt");
+                    }
                     exit = true;
                     System.out.println("Exiting...");
                     break;