ws4

src/main/java/Main.java

@@ -70,12 +70,7 @@ public class Main {
         boolean success;
         switch (choice) {
             case 1:
-                success = school.registerStudent(username, password);
-                if (success) {
-                    System.out.println(" Student registered successfully!");
-                } else {
-                    System.out.println(" Username already exists!");
-                }
+                //TODO
                 break;
             case 2:
                 success = school.registerTeacher(username, password);
@@ -108,12 +103,7 @@ public class Main {
 
         switch (choice) {
             case 1:
-                Student student = school.loginStudent(username, password);
-                if (student != null) {
-                    studentMenu(student);
-                } else {
-                    System.out.println(" Invalid username or password!");
-                }
+                //TODO
                 break;
             case 2:
                 Teacher teacher = school.loginTeacher(username, password);
@@ -151,7 +141,7 @@ public class Main {
                     enrollInCourse(student);
                     break;
                 case 3:
-                    System.out.print(student.getMyCoursesDisplay());
+                    //System.out.print(student.getMyCoursesDisplay());
                     break;
                 case 4:
                     System.out.println(" Goodbye, " + student.getUsername() + "!");
@@ -163,21 +153,7 @@ public class Main {
     }
 
     private static void enrollInCourse(Student student) {
-        System.out.print(school.getAllCoursesDisplay());
-        System.out.print("\nEnter Course ID to enroll: ");
-        int courseId = getIntInput();
-
-        Course course = school.findCourseById(courseId);
-        if (course == null) {
-            System.out.println(" Course not found! Please enter a valid ID.");
-            return;
-        }
-
-        if (student.enrollInCourse(course)) {
-            System.out.println(" Successfully enrolled in " + course.getName());
-        } else {
-            System.out.println(" You are already enrolled in this course!");
-        }
+       //TODO
     }
 
     // ==================== TEACHER MENU ====================

src/main/java/models/Student.java

@@ -11,28 +11,20 @@ public class Student extends User {
         this.enrolledCourses = new ArrayList<>();
     }
 
-    public boolean enrollInCourse(Course course) {
-        if (enrolledCourses.contains(course)) {
-            return false;
+    public void enrollCourse(Course course) {
+        this.enrolledCourses.add(course);
+    }
+    public void showMyCourses() {
+        for (Course course : this.enrolledCourses) {
+            System.out.println(course);
         }
-        enrolledCourses.add(course);
-        course.addStudent(this);
-        return true;
     }
-
-    public List<Course> getEnrolledCourses() {
-        return enrolledCourses;
-    }
-
-    public String getMyCoursesDisplay() {
-        if (enrolledCourses.isEmpty()) {
-            return " You are not enrolled in any course yet.";
-        } else {
-            StringBuilder sb = new StringBuilder("\n My Courses:\n");
-            for (int i = 0; i < enrolledCourses.size(); i++) {
-                sb.append("  ").append(i+1).append(". ").append(enrolledCourses.get(i)).append("\n");
+    public Course getEnrolledCourses(int id) {
+        for (Course course : this.enrolledCourses) {
+            if (course.getId() == id) {
+                return course;
             }
-            return sb.toString();
         }
+        return null;
     }
 }

src/main/java/models/Teacher.java

@@ -32,26 +32,22 @@ public class Teacher extends User {
         return myCourses;
     }
 
-    public String getMyCoursesDisplay() {
+    public void showMyCourses() {
         if (myCourses.isEmpty()) {
-            return " You don't teach any course yet.";
+            System.out.println(" You don't teach any course yet.");
         } else {
-            StringBuilder sb = new StringBuilder("\n My Courses:\n");
+            System.out.println("\n My Courses:");
             for (int i = 0; i < myCourses.size(); i++) {
-                sb.append("  ").append(i+1).append(". ").append(myCourses.get(i)).append("\n");
+                System.out.println("  " + (i+1) + ". " + myCourses.get(i));
             }
-            return sb.toString();
         }
     }
 
-    public boolean checkCourseOwnership(Course course) {
-        return myCourses.contains(course);
-    }
-
-    public String getStudentsDisplayForCourse(Course course) {
+    public void showStudentsInCourse(Course course) {
         if (!myCourses.contains(course)) {
-            return "You don't teach this course!";
+            System.out.println(" You don't teach this course!");
+            return;
         }
-        return course.getStudentsDisplay();
+        course.showStudents();
     }
 }

src/main/java/services/SchoolSystem.java

@@ -16,25 +16,23 @@ public class SchoolSystem {
     }
 
     // ========== Student Management ==========
-    public boolean registerStudent(String username, String password) {
-        if (findStudent(username) != null) {
-            return false;
-        }
-        students.add(new Student(username, password));
-        return true;
+    public void registerStudent(String username, String password) {
+        Student student = new Student(username, password);
+        this.students.add(student);
     }
-
     public Student loginStudent(String username, String password) {
-        Student student = findStudent(username);
-        if (student != null && student.checkPassword(password)) {
-            return student;
+        for (Student student : this.students) {
+            if (student.getUsername().equals(username) && student.checkPassword(password)) {
+                return student;
+            }
         }
         return null;
     }
-
     private Student findStudent(String username) {
-        for (Student s : students) {
-            if (s.getUsername().equals(username)) return s;
+        for (Student student : this.students) {
+            if (student.getUsername().equals(username)) {
+                return student;
+            }
         }
         return null;
     }
@@ -65,19 +63,17 @@ public class SchoolSystem {
 
     // ========== Course Management ==========
     public boolean addCourseToSystem(String courseName) {
-        for (Course c : allCourses) {
-            if (c.getName().equals(courseName)) {
-                return false;
-            }
-        }
-        allCourses.add(new Course(courseName));
+        Course course = new Course(courseName);
+        this.allCourses.add(course);
         return true;
     }
 
     public Course findCourseById(int id) {
-        for (Course c : allCourses) {
-            if (c.getId() == id) return c;
-        }
+       for  (Course course : this.allCourses) {
+           if(course.getId() == id) {
+               return course;
+           }
+       }
         return null;
     }