..

src/CourseRegistrationStarter/RegistrationSystem.java

@@ -10,15 +10,24 @@ 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
+
+        for(int i=0; i<courses.size(); i++){
+            if (((courses.get(i)).getCourseCode()).equals(code))
+                return courses.get(i);
+        }
         return null;
     }
 
     public void showAllCourses() {
         // TODO: Print all courses in the system
+        for (int i = 0; i < courses.size(); i++) {
+        System.out.println(courses.get(i).getCourseName());
+    }
     }
 }