Complete code

src/main/java/Main.java

@@ -70,7 +70,13 @@ public class Main {
         boolean success;
         switch (choice) {
             case 1:
-                //TODO
+                success = school.registerStudent(username, password);
+                if(success){
+                    System.out.println(" Student registered successfully!");
+                }
+                else{
+                    System.out.println(" Username already exists!");
+                }
                 break;
             case 2:
                 success = school.registerTeacher(username, password);
@@ -103,7 +109,13 @@ public class Main {
 
         switch (choice) {
             case 1:
-                //TODO
+                Student student = school.loginStudent(username, password);
+                if(student != null){
+                    studentMenu(student);
+                }
+                else{
+                    System.out.println(" Invalid username or password!");
+                }
                 break;
             case 2:
                 Teacher teacher = school.loginTeacher(username, password);
@@ -153,7 +165,12 @@ public class Main {
     }
 
     private static void enrollInCourse(Student student) {
-       //TODO
+        System.out.println("\n Select a course:\n");
+        school.getAllCoursesDisplay();
+        System.out.println();
+        String courseName = scanner.toString();
+        Course course = school.findCourseByName(courseName);
+        student.enrollInCourse(course);
     }
 
     // ==================== TEACHER MENU ====================