hal tamrin

src/CourseRegistrationStarter/Main.java

@@ -10,5 +10,25 @@ public class Main {
         // 5. Register the student in some courses
         // 6. Drop one course
         // 7. Print the final registered course list
-    }
+
-}
+                Course c1 = new Course("Math", "M101", 3);
+                Course c2 = new Course("Physics", "P202", 2);
+                Course c3 = new Course("Programming", "CS303", 1);
+                Student s1 = new Student("Ali", "S123");
+
+                RegistrationSystem system = new RegistrationSystem();
+
+                system.addCourseToSystem(c1);
+                system.addCourseToSystem(c2);
+                system.addCourseToSystem(c3);
+
+                s1.addCourse(c1);
+                s1.addCourse(c2);
+
+                s1.dropCourse(c1);
+
+                s1.showRegisteredCourses();
+            }
+        }
+
+

src/CourseRegistrationStarter/RegistrationSystem.java

@@ -10,15 +10,27 @@ public class RegistrationSystem {
 
     public void addCourseToSystem(Course c) {
         // TODO: Add the course to the system
+        courses.add(c);
+
     }
 
     public Course findCourseByCode(String code) {
         // TODO: Search for a course by course code
         // Return the matching course if found, otherwise return null
+        //return null;
+        for (Course c : courses) {
+            if (c.getCourseCode().equals(code)) {
+                return c;
+            }
+        }
         return null;
     }
 
     public void showAllCourses() {
         // TODO: Print all courses in the system
+        for (Course c : courses) {
+            System.out.println(c.getCourseName() + " (" + c.getCourseCode() + ") Capacity: " + c.getCapacity());
+        }
+
     }
 }

src/CourseRegistrationStarter/Student.java

@@ -23,17 +23,45 @@ public class Student {
     public boolean addCourse(Course c) {
         // TODO: Register the student in the course if capacity allows
         // Return true if registration was successful, otherwise false
+       // return false;
+        if (registeredCourses.contains(c)) {
+            return false;
+        }
+
+        if (c.reduceCapacity()) {
+            registeredCourses.add(c);
+            return true;
+        }
+
         return false;
+
     }
 
     public boolean dropCourse(Course c) {
         // TODO: Remove the course from the student's list
         // Restore the course capacity if removal was successful
         // Return true if the course was dropped, otherwise false
+        //return false;
+        if (registeredCourses.contains(c)) {
+            registeredCourses.remove(c);
+            c.increaseCapacity();
+            return true;
+        }
+
         return false;
+
     }
 
     public void showRegisteredCourses() {
         // TODO: Print all registered courses
+        if (registeredCourses.isEmpty()) {
+            System.out.println("No courses registered.");
+            return;
+        }
+
+        for (Course c : registeredCourses) {
+            System.out.println(c.getCourseName() + " (" + c.getCourseCode() + ")");
+        }
+
     }
 }