Complete course registration system + bonus features

src/CourseRegistrationStarter/Student.java

@@ -21,19 +21,44 @@ 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)){
+            System.out.println("You have already registered in this course!"+"\n");
+            return (false);
+        } else if (registeredCourses.size()== 2){
+            System.out.println("You have reached the maximum number of allowed courses!"+"\n");
+            return (false);
+        }
+        else if (c.getCapacity()>0){
+            registeredCourses.add(c);
+            c.reduceCapacity();
+            return (true);
+        }else{
+            System.out.println("Registration was not successful!"+"\n"+"This course has no capacity left."+"\n");
+            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);
+        }else{
+            System.out.println("Course drop failed!"+"\n"+"You are not registered for this course."+"\n");
+            return (false);
+        }
+
     }
 
     public void showRegisteredCourses() {
-        // TODO: Print all registered courses
+        if(registeredCourses.size()==0){
+            System.out.println(Main.st.getName() + "hasn't registered for any course."+"\n");
+
+        }
+        else {
+            for (int i = 0; i <= registeredCourses.size() - 1; i++) {
+                System.out.println(registeredCourses.get(i).getCourseName() + "(" + registeredCourses.get(i).getCourseCode() + ")" + "\n");
+            }
+        }
     }
 }